Fabrication 2025 – Coupling Limit

You may have noticed a new setting in Fabrication 2025. You can see it when you edit the properties of a Service Template. It’s shows as Maximum # couplings. Valid settings are 1 to 10. So what is this setting you may ask? Well, don’t go with your instincts. The name is as unintuitive as possible.

To start, couplings are any ITM made from Pattern (CID) 2522. So not necessarily an actual “pipe” coupling. So this setting only applies to any fitting made from Pattern 2522 regardless of what it does in the real world. No other patterns are affected.

Your initial instinct might be that this limits the number of coupling patterns on a service template. You’d be wrong. When you think about it, a lot of things are made from Pattern 2522. Couplings obviously, but also Welds, Flanges. some Reducers, Adaptors, Unions, Bolt Sets, Gaskets, etc. That can easily push the number over 10. So what exactly does this do?

First, a little background. To start this setting only applies to Revit. No other Fabrication products are affected aside from using them to edit the setting. Next, you should know that there was always a coupling limit as it pertained to Revit. It was hard coded to 7 (or so I’m told). This change in the 2025 Fabrication products made it editable to a smaller (minimum 1) or larger number (maximum 10).

What this settings does is control the connect and coupling logic in Revit. Revit’s autofill features like Route and Fill, Multi-Point Routing, Quick Connect and Design to Fabrication are affected. This is because the coupling pattern is special. In most scenarios, pipe is connected to fittings. In come cases, fittings to fittings. Coupling patterns on the other hand, can connect to other coupling patterns repeatedly.

These autofill functions need to process the various options for fittings. This can have performance implications that increase exponentially the more parts you have using those patterns. Let’s look at an example….

The below image shows a pipe flange connection. It’s using 6 coupling patterns in a row in the model. But in your service, there may be even more. Different types of flanges, welds, gasket and bolt set options, etc. It needs to look at all of those to determine the options available. In this case, a coupling limit of 6 would work. That’s how many 2522 patterns you would ever string together to make this connection. So after 6, Revit no longer needs to keep looking for couplings and can limit it’s analysis to other pipe or fittings in your service.

As you can see, the old hard coded value of 7 would be enough to cover most flanged or dielectric connection options. In some very limited edge cases, you might need more. So now you can bump it up to 10. However, you may want to actually reduce it lower. If you’re using ancillaries for gaskets and bolt sets and not drawing ITM’s to quantify them, a setting of 4 would be sufficient. For some systems, you might even be able to go lower.

What happens if the coupling limit is lower than what’s needed? Well, you might have to make those connections manually. Autofill functions wouldn’t provide all of the possible options. In some cases, you might event get broken connections.

Personally I’ve not been able to create a sample dataset and configuration that really demonstrates functionality working or not based on the setting. For the most part, it’s likely not going to affect most users however lowering it might provide some performance improvements in Revit. They tell me ideally the setting would be 3 or 4. But as you can see, if you’re using ITM parts for Bolt Sets and Gaskets, 6 is likely your “Go To” number. But on a plastic system? 3 or 4, maybe even 2 would be sufficient.

Configuring Fabrication Configurations

When you manually add a Fabrication Configuration to your system yourself, it only works for the currently logged in user. In fact, you may have noticed this with your own configurations compared to the default ones Autodesk adds during installation. You can see the difference by the presence of a little Yellow Lock icon in the lower left of the Configuration’s image.

So when you use the Add Link option to add a configuration, it’ll only exist for you. If someone else logs into the computer, the configuration won’t be displayed for the new user. Autodesk’s on the other hand…will still be there.

The difference between these two ways Configurations work is based on how the configurations are “configured” in the Windows Registry. So let’s take a look by starting the Registry Editor.

The first thing to know, is that there’s two ways to start the Registry. Just running the REGEDIT command opens the editor and displays everything. The other way is to Run as Administrator. When just run, you’ll have read/write access to the HKEY_CURRENT_USER branch (‘Hive’ is the proper term) often abbreviated as HKCU. This is the branch where the User configurations are stored.

The Computer based Configurations (like Autodesk’s) are stored in the HKEY_LOCAL_MACHINE branch often abbreviated as HKLM. When you run REGEDIT normally, you’ll see the HKLM branch but it’s Read-Only. To write to the HKLM branch, you’ll need to launch REGEDIT with the Run as Administrator option. Your IT Department may restrict this from you so you may need to involve them if you want to implement Computer based Fabrication Configurations.

The other thing to note, is that when you Run as Administrator, the HKCU branch is there but the settings may be missing or different. This is because, the Registry Editor is technically running as another user and that branch is User specific. You can see the two branches I’ve referenced in the following image.


Converting Configurations to ‘Computer’ Based

While you can edit the Registry manually, the easiest way to convert your Fabrication Configurations to be Computer based (not User) is to run the Registry Editor normally (not as Administrator) and export the HKEY_CURRENT_USER settings. The settings are in the key…

HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\Fabrication <year>\Configuration

The <year> represents the version year of Autodesk Fabrication (CADmep, ESTmep, CAMduct, Remote Entry, etc.) or Revit. You can see that in the following image. If the Configuration key isn’t there, that means there’s no configurations “configured” for that version year. If a specific “year” isn’t listed, it means that version wasn’t installed.

Once you get to the Configuration Key, you can export it using the File -> Export option as shown here…

While you can Export a single configuration, I like to pick the Configuration Key and do them all. We can get rid of what we don’t want later. The main point to note when exporting is to change the Save as type: to the Win9x/NT4 Registration Files (*.reg) option. This will save the export in ASCII text which you can edit in Notepad.

Once you export to a file, you can right click on the file and select Edit to open in Notepad. The following image shows how it looks and is marked up what I’ve removed vs added/edited. Note I also edited the Registry Hive from HKEY_CURRENT_USER to HKEY_LOCAL_MACHINE.

Once you’ve edited the file and saved it, you’re almost ready to import it. It’s generally not advisable to have the same configuration with the same name and same path in both the HKCU and HKLM branches.

So first, you can run REGEDIT normally and rename the Configuration folder…or just delete it (if you’re comfortable doing so). Then close the Registry Editor and run it again but Run as Administrator. You can now Import the file you just edited to import those new Registry settings. The following image shows what both branches might look like…

Now, when you launch Fabrication (CADmep, CAMduct, ESTmep, etc.) you’ll see the little Yellow Lock icon on your configurations. Revit won’t show that little icon but it does honor the ‘User’ vs ‘Computer’ configurations.


A Word About Fabrication ‘Profiles’

One side effect of ‘Computer’ or machine based Fabrication Configurations shows up if you use Profiles in your Fabrication Configuration. It doesn’t apply to Revit but does CADmep, CAMduct and ESTmep. When you use Profiles with ‘User’ based Configurations, the last active profile will be the default when you launch the program again. With ‘Computer’ or machine based profiles, you’ll always default back to the Global profile.

However this is easily fixed. To start, let’s look at the ‘User’ based configurations under HKCU when a profile was used…

You’ll see there’s now an ActiveProfile value in the configuration that wasn’t there before. That’s how Fabrication knows which profile to load by default. But also remember, the HKLM branch of the registry is normally Read-Only. So this means those programs can’t create this value when you change profiles.

The solution to this, is making those registry keys Read-Write in the HKLM registry branch. You can do that by running REGEDIT as an administrator like before and navigating to the proper registry keys. From here, you can Right-Click on the Key’s name and select Permissions….

You can do this on a specific configuration or at the root Configuration key and the permissions will be inherited by the downstream keys. Once the Permissions dialog shows up, select the User permission group and select the Allow toggle for Full Control. Again, you may need your IT’s help if you don’t have permissions to do this.

This will now allow CADmep, CAMduct and ESTmep to save the last Fabrication Profile to the Registry in the HKLM branch so when you start the software the next time, it’ll be able to use the last Profile used.

One good side effect of changing these permissions…you’ll now also be able to import or create more Fabrication Configurations in HKLM in the future WITHOUT having to Run as Administrator as you’ll now have Read-Write permissions to those keys by default.

Make sure if you do these steps, to do them for all versions of Fabrication. You can even make entries for versions you don’t have installed so they work later if you install that version. So if you want to prepare for 2025 versions, you can copy/paste/edit those registry settings in the file you exported and rename them as 2025 (or older versions) all in the same file, Being proactive in this way will minimize future support downtime.

Retaining Customization During Upgrades

One of the more annoying things users find with upgrading Autodesk Fabrication is losing their customizations. Things like column configurations in the old version do not magically appear in the new version.

But this problem is actually fairly solvable. You just need to know where to look. And those settings are located in a local folder on your system. They’re USER specific….VERSION specific and PRODUCT specific. Here’s where you’re going to look…

C:\Users\<UserName>dyoung\AppData\Local\Autodesk\Fabrication <Version>\<Product>

Each user will have a folder for the version and product they’re using. If the Version/Product isn’t there, that means the product is not installed or that combination of Version and Product was not run yet.

So as an example, if you’re using ESTmep 2021 and have your columns all configured, you’ll find that folder. But if you just installed 2024 and not run it yet, ESTmep 2024’s folder may not be there. If it is, the settings will not be the same.

In our theoretical example of upgrading from ESTmep 2021 to ESTmep 2024, you’ll copy the folder/contents from 2021 into 2024. If the ESTmep folder doesn’t exist in 2024, just copy the entire folder.

You can even copy the contents of ESTmep to the CAMduct folder. This would make the column configurations the same for those two product to be the same. You can also copy a product version from one user to another user. Either on the same computer or a complete different computer.

The folders may have different numbers of file between them. They control different things. The lack of a particular file within the Product folder means a particular feature wasn’t customized.

You could play around using trial and error and see exactly which file controls which settings. But I’ve personally not found that to be worth the effort. I just copy them all so I know that my new install is the same as the prior.

Another thing I usually recommend to people upgrading, is find the person who’s settings you want to use. Save those folders somewhere on the network for easy access. When you install/upgrade other users, copy them from the network local to the person you’re setting up.

Using this technique, you can easily keep your Fabrication product customizations consistent…version to version, product to product, user to user and computer to computer.

Fabrication Pricing, Labor and Product Information

I have a lot of people ask how Pricing, Labor and Product Information (ProdInfo) works in Autodesk Fabrication. It’s a simple concept once you understand it. But it’s also rarely illustrated graphically so I’ll attempt a more graphical explanation here.

At it’s core Product Information requires the use of an ID, sometimes referred to as a Database ID. Pricing and Labor can be handled two separate ways depending how you need to price and labor your items. One of those ways is using Product Listed Pricing and/or Labor. When using Product Listed Prices or Labor, you also use an ID.

Generally speaking, 100% of your parts should have and ID. ID’s should also be unique without a very good reason for duplication. There are a couple good reasons to duplicate ID’s across content but we won’t get into that here. If this article is helpful to you, those reasons would only serve to complicate the issue at this point.


Product Information & Product Listed Prices & Labor

When you have an ID associated with your ITM content, that ID serves as the “Glue” to tie together all the other database tables in Autodesk Fabrication. An ITM with an ID, looks up that ID in the Product Information database to find the related product information. IT also does the same for Pricing, Fabrication Labor and Installation Labor.

The following images shows where the ID is stored in your ITM Content. For ITM’s which are NOT Product Listed, you simply type the ID into the “Code” field from the Properties window.

For Product Listed ITM’s, it’s handled slightly different. You add the ID column to the Product List and add the ID’s there. When you add a product listed ITM to your model or takeoff, the value of the ID for the size you select gets automatically placed in the “Code” property. When that ITM is merely sitting in your library on disk, the value here doesn’t matter. It can be blank or any one of the ones in the Product List. Adding the ITM to your model then updates it to the proper ID.


Product Information

Product Information or ProdInfo for short lists additional data about the fitting or item. The following image shows the related data in ProdInfo with the ID column outlined.

In addition to standard product information, you can also change to a Supplier view of ProdInfo where you can add additional columns for any other types of data or numbers you want to track. The following image shows some added data fields like UPC Code and Harrison HPH codes.


Pricing

The following image shows a Product Listed Pricing Table. The ID is outlined. Here’s where you can add pricing information to the ID of the ITM. Note, the term Product Listed Price here is a little confusing because “Product Listed” prices can apply to non-product listed ITM’s. While an ITM may not contain a “Product List“, the pricing table is still a “List of Products” that are referenced by ID.


Labor (Fabrication & Installation)

In the same way Price List’s work, Fabrication and Installation Labor work in a similar way. Product Listed labor can apply to any ITM, Product Listed or not as long as it has an ID. The following image shows Fabrication labor but Installation Labor works identically.


Breakpoint Pricing & Labor

A second way to specify Price and Labor doesn’t require ID’s because they’re not looked up from a list. These would be Breakpoint Price and Labor tables. With this type of Price or Labor table, you build a 1d or 2d Breakpoint Table that uses the part’s size as a guide to look up the proper price or labor rate in a matrix.


Price Breakpoint

The following image shows a Pricing Breakpoint table. You can make more than one breakpoint grid and have each apply to a different material if you have the need.


Labor (Fabrication & Installation) Breakpoint

Similar to a Price Breakpoint, you can make a matrix for Labor as well. With Labor Breakpoints, you can also make more than one matrix and have it apply to various properties of the item labor is being applied to like Insulated or Non-Insulated.


Finding the Right Price & Labor Tables

While all you need for ProdInfo is an ID on an ITM and matching ID entry in the ProdInfo Database, Price and Labor need an extra step.

Price and Labor can have multiple tables to help you organize the values or even manage the price for the same item from multiple suppliers. To handle this, you set the tables in the ITM properties. This is true for both Product Listed ITM’s as well as Non-Product Listed ITM’s.

Setting these tables tells Fabrication which table to look in to find either the ID or the Breakpoint table which uses size and property criteria to apply to the ITM.

The following image shows where those tables are configured in the Costing tab of the ITM properties.

M-Rate is were the Price of the material comes from. This is set typically for bought items where you pay a set price. If you leave this set to “None“, material pricing would be calculated on a “Price per Pound” formula based on the material weight. This is typically done for Fabricated Sheetmetal fittings where the weight of the Sheetmetal is calculated based on area and gauge and then priced per pound. For piping or bought items, this table would typically point to a table that contains the pricing.

F-Rate is where you select the Fabrication Table to use to look up the Breakpoint Table or ID if Product listed labor. This is most commonly set to “None” for Piping items or other bought items where you just buy them but don’t fabricate them. It’s usually set to a specific table for Sheetmetal fittings which you fabricate and want to calculate fabrication labor.

E-Rate – This table is for Installation Labor. The “E” in “E-Rate” stands for “Erection” if that helps you remember. This will be set for most contractors who are installing duct or piping. It would typically be set to “None” if you were a fabricator only selling to others who install.


Summary

Hopefully this helps give you an idea how pricing, labor and product information functions (at a high level) in Autodesk Fabrication. There’s a lot more strategy and nuance you can get into but this is a good place to start understanding the basics of how it all works.

Fabrication 2022.0.1 Update Released

Update: 2022.09.04

It’s recommended NOT to install this update for CAMduct or ESTmep. Installing the 2022.0.1 Update will prevent access to the Projects folder. CADmep does not appear to have issues with this update.

Thanks to Chris Nash of William R. Nash Company for reporting this issue on the XtraCAD.Com forums.

It’s been a long time, but Autodesk finally released an update to Autodesk Fabrication. 2022.0.1 Update was released recently and contains several fixes for 2022 versions of CADmep, CAMduct and ESTmep.

Install from the Autodesk Desktop App or download from your Autodesk Account portal (https://manage.autodesk.com)

Autodesk Fabrication COD Object Model

I’ve added graphics to better illustrate the Autodesk Fabrication Object Model for COD Scripting,

If you write COD scripts for CADmep, ESTmep or CAMduct, this can help you better understand how the various properties and objects are structured when you write your code.

If you want to learn more about Fabrication COD Scripting and how to use these resources, register for MEP Force 2021 and look for my Fabrication Scripting sessions.

You can find links with the other Fabrication COD Language Reference items here…

Fabrication COD Scripting Language Reference

Individual Object Models can be directly accessed here…

There’s also a link to a printable PDF of the Object Models….

Fabrication COD Script Library – Updated

If you’ve not downloaded the Autodesk Fabrication Script Libraries lately, you might want to grab an updated copy. There’s been several updates over the last month. Here’s what’s changed…

  • Damper Rotation Property (undocumented) has been added to all Debug, Job and Library scripts. Support for this property was added in 2017 but never documented. It’s there to support the rotation of Dampers on Fabrication Parts in Revit. It should be noted, that this value is Added to the Angle property of the assigned damper. As such, it acts as an Adjust and not an Override. e.g. Damper w/Angle of 90 + Rotation Property in the ITM of 90 results in a damper rotated 180 degrees.
  • Stiffener Group Property added to the Autodesk Fabrication 2022.0 and later versions of the Debug, Job and Library scripts.
  • Airturn Group Property added to the Autodesk Fabrication 2022.0 and later versions of the Debug, Job and Library scripts.
  • Splitter Group Property added to the Autodesk Fabrication 2022.0 and later versions of the Debug, Job and Library scripts.
  • Insulation StatusLock Property added but listed as “Unavailable” as it stopped working in 2017. Added in the hopes it gets fixed in future versions.
  • StructureType Property added to the Autodesk Fabrication 2022.0 and later versions of the Debug, Job and Library scripts. Property was “Write Only” in 2021 and prior versions so was unable to display in prior versions.
  • Product List HasCustomData Property has been added to all Debug, Job and Library scripts.
  • Product List HasFlow Property has been added to all Debug, Job and Library scripts.
  • Item PCFSKey Property has been added to all Debug, Job and Library scripts.
  • Item CostByLength Property removed from Material Debug scripts (never really belonged there).

You can find the updated scripts here….Script Library.

New Properties are documented here…Item Property Reference.

Fabrication 2022 Bug – Configure Users

If you run Autodesk Fabrication as a multi-user installation, there’s a defect in the Configure Users utility. When you run the utility from a 2022 installation, it won’t read any of the user accounts you have configured.

In fact, the only way to login, is to use the Default Administrator account Autodesk uses if there are no users configured. It won’t read your Administrative account regardless of what the login is. To see the issue, you can use the following to login and see the problem…

User Name: Administrator
Password:  Admin

Once logged in, there will be one account. You can make more but when you exit and come back in, those accounts don’t show up. IN fact, even the original Administrator account isn’t there, it’ll make a new one. The following image shoes the users accounts that were created in 2022 be repeatedly going into it. Next to it is the 2021 utility showing those same accounts. As you can see, they are there, its just 2022 won’t show them.

Note that all the other Fabrication products will read/honor the accounts properly. It only seems to be the Configure Users utility that had the issue.

How to Determine Which Version of Configure Users To Run

To make things ‘easy’, Autodesk chose not to add the version in the name of the shortcut. Simply looking for ‘Configure Users‘ shows a lot of indeterminate results.

To pick a particular version, Right-Click on one of the shortcuts and select ‘Open file location‘.

This will display a File Explorer window to the location of the shortcut you selected. As you can see below, the one I happened to pick was for CAMduct Components 2016. The product doesn’t matter, only the version, You can navigate back a folder then pick one of the Fabrication products for any version you want. 2021 and earlier will work.

Not sure if or when they’ll get around to fixing this. While 2022 has had a few issues fixed, they didn’t release any updates (yet) for 2021. Regardless if they fix it or not, it’s easy to work around by using any other version.

Revit 2022 – Missing Fabrication Addins (temporary fix)

Update (2020.04.08): Autodesk released the Extension for MEP Fabrication 2022 on April 8th. You can get it from the Autodesk Desktop App or from your Autodesk Accounts Portal (manage.autodesk.com). This restores the MAJ Import/Export functionality and access to Fabrication Reports. It does NOT install the RME to FAB add-in. So part of the below guidance is still needed. You’ll want to copy the ADSK_Export.addin file per the below instructions. The other file is no longer needed and Autodesk’s newly released Extension will overwrite what’s needed if you used the below guidance.


If you’re an Autodesk Fabrication user and loaded up Revit 2022, you may have noticed some key Fabrication Add-ins are missing. It happens most every release. Deadlines for product releases always trump add-ins. This year, all the installers were reworked too so there was extra work I’m sure.

Don’t fear, they’ll get to them eventually. Just keep an eye on the Desktop App for when the updated Add-ins are release. In the mean time, here’s a temporary fix…

Enabling Fabrication Add-ins

To get the Fabrication Add-ins, you’ll need Revit 2021 installed and have those add-ins loaded in there. From there, there’s 2 files you’ll need to copy to a different folder.

Autodesk.MEPFabricationPart.Commands.Application.addin
ADSK_Export.addin

The first file enables MAJ Import/Export and Fabrication Reports. The second file enables the Fabrication RME Extension in the Add-ins Ribbon.

You copy them from this folder…

C:\ProgramData\Autodesk\Revit\Addins\2021

…to this folder…

C:\ProgramData\Autodesk\Revit\Addins\2022

Here’s what that looks like in Windows Explorer….

What This Looks Like in Revit

Once you copy those files, restart Revit to see the changes. Here’s a review of what that looks like…

MAJ Exports

MAJ Import

Fabrication Reports

A Parting Word

It should be noted that this work around should be considered “temporary”. You’re running 2021 Add-ins in 2022. The files you coped should be removed once the official 2022 Add-ins are released. This will ensure you get any fixes they may have added to the 2022 versions.

Renumber Revit Fab Parts – No Purchase or Coding Required

Most MEP contractors moving to Revit with Fabrication Parts at some point wrestle with renumbering parts. You can purchase tools or add-ins to make this easier or even write your own with Dynamo or C#.

But most contractors aren’t coders. And buying more software can also be a challenge. The good news is that those are not your only options, There’s some well written FREE Revit Add-Ins that make this a breeze.

Required Tools

Head over to DiRoot’s web site (https://diroots.com/) and download the OneFilter Add-In found here and the ReOrdering Add-In found here.

Once installed, you’ll find the tools in the DiRoots Ribbon in Revit along with any of their other tools you may have installed.

Getting Started

The following image shows 2 runs of Rectangular and 2 runs of Round duct work drawn in Revit using Fabrication Parts. One is drawn in a +2in WG service and the other -2in WG service. All duct has a tag configured to display the Fabrication Part’s Item Number property.

First Up – DiRoots OneFilter

Using the DiRoot’s OneFilter Add-In, you can easily select not just Fabrication Parts, but also select them based on their properties.

Once selected, you can see Revit selects the specified items in your model.

Next – DiRoots ReOrdering

Now that your desired parts are selected, you can use the DiRoots ReOrdering Add-In to renumber those parts.

After applying your renumbering parameters, you can see how Revit then displayed the updated Item Numbers for the Fabrication Parts.

Wrapup

As you can see, with a couple free (well written) utilities you can quickly and easily select and renumber your fabrication parts in Revit.

There’s a lot of other reasons beyond renumbering to use some of these Add-Ins. They’re very functional for a lot of workflows. Those uses are beyond the scope of this post but feel free to explore these Add-Ins or some of the other DiRoots tools when you get a chance. They’re some of the highest quality free Add-Ins for Revit than you’ll find anywhere.