Rebrickable Help Guide: Assembled Lists | Rebrickable

Assembled Lists

After adding your Sets and Parts to your LEGO Collection at Rebrickable, you can use the Build functionality to see what other Sets/MOCs you can build with those parts.

The Assembled Lists feature (previously known as Assembled Sets) allows you to mark specific parts as being in-use and excluded from those build calculations. For example, you build a MOC and want to keep it on display for a while. The parts in that MOC can be added to an Assembled List, which tells the Build calculations to exclude them from your buildable collection, so any future Build calculations know you don't have those parts available for use.

NOTE: the parts in your Assembled Lists must also be in your buildable LEGO Collection, otherwise the build results may be inaccurate. Checks are performed in several places to notify you when there is an issue.

Overview

Assembled Lists are actually a special type of Custom List. Go to My LEGO > My Custom Lists and you can see your lists grouped by their list type on the left.

To convert a normal Custom List to an Assembled Custom List, edit the list details and change it's type to Assembled:

You can also create an assembled list directly from a set or MOC page by clicking on Mark Parts as Assembled button. If you have any parts missing from the main inventory you will see this warning and not be able to proceed.

If you have all the parts needed you will be able to choose to include spare parts and/or minifig parts and are able to select an assembled list to add the parts to. It is recommended (at least for beginners) to put each set or MOC on a different list so it is easier to troubleshoot any errors and to know where your parts are being used. Click New List and type a name for the assembled list before clicking Add All Parts.

Build Testing

When viewing Assembled Lists and Build result pages, some automatic checks are performed to ensure you are using the feature properly.

Two types of tests are performed - 1. When viewing a specific Assembled List, a Build calculation will ensure all the parts in that list exist in your buildable collection. 2. Another calculation will do the same check for all your Assembled Lists combined, which is what the normal Build calculations do when building any Set or MOC.

When there are problems, you will see an error like this one:

It is possible for one specific Assembled List to be ok, but the combined test to fail:

In the error message, you can use the Build Results link to see the exact parts that are causing problems. You will need to go through your Assembled Lists, Part Lists and Set Lists to resolve things. Remember - every part in your Assembled Lists must exist in your buildable LEGO collection.

Some common issues are:

You have added a Set to an Assembled List which is a different version to the one in your My Sets page.
You have marked a Set/Part List as non-buildable while also keeping those parts in an Assembled List.
Your build settings allow mold substitutions, so a different mold varient is used in the MOC to the one you have. In this case please edit the part on your assembled list to match your collection.

Substitutions and Modifications

Assembled lists are useful for when you are building a MOC or set where you don't have all the parts, or want to make some substitutions. The best way to do so is as follows.

On the Set/MOC page click Add Set's Parts to List and create a new custom list (not assembled) with the parts.
Navigate to that custom list and make any changes to the parts by removing the parts you will be skipping, and adding extra ones you want to add.
Click Build this List to check you have all the parts on the list.
Change the list type to assembled by clicking Edit List Details.
Confirm that assembled list has no errors.

Last modified March 19, 2025 by icedragonj

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HELP - Assembled Lists

Assembled Lists

Overview

Build Testing

Substitutions and Modifications

Time

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