Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start:- Looking for a certain topic? Check out the categories filter or use Search (upper right).
- Need support? Ask a question to our Community Support category.
- Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
- Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
Best Of
Re: Why do I get non-manifold edges simply by doing a transform/rotate and how do I fix it?
Prusa slicer (on which Bambu slicer is based) reports the same. I'm guessing it's an artifact of how the slicer imports and tessellates the non-mesh file. Importing meshes is trivial; importing CAD data is hard. Separately, I would definitely not do the rotation in CAD - your slicer can do that fine.
Do you see any issues with the slicing? Even with the bad edges, the preview looks totally printable.

Why do I get non-manifold edges simply by doing a transform/rotate and how do I fix it?
Hi, I'm new here.
I tried searching the forums for similar issues, but could not find any topic related to non-manifold when doing a rotate.
So I have a model, which works fine as it is and has no issues. I wanted to export it at an angled position, so it's easier to print this way, so I added a transform/rotate step.
But simply doing this transform causes the STEP file export to get 8 non-manifold edges (at least Bambu Studio says so). Removing the transform fixes the issue, so it's somehow related.
Exporting a 3MF file does not have the same issue, so it also seems to be related to the STEP file format.
I'm guessing this is a bug. Has anyone encountered something similar?

Non-manifold geometry, how to solve?
Here's my document, if someone wants to poke around: https://cad.onshape.com/documents/526d038b98a28fdcb20dfa41/w/54b6f21c62fce1ec0fb84245/e/0d2432d11fa3e95c8c667e26?renderMode=0&uiState=66aeb7570ca3d416ff4aa11e
Thank you!
Re: Can you please check what is causing the nonmanifold geometry
https://cad.onshape.com/documents/5df2367fcf8d4801e570bc6a/v/5f3ba1dd145270fc7fa7e315/e/4bcc4dbca50716b3f11efef3?renderMode=0&uiState=653f9a8077edcf48d080192c
Thank you for your help!
Re: Why is this non-manifold? (No it isn't.) What's the quickest workaround?

Zoomed in to see the overlap.

At .011 OnShape accepted the overlap's existence.

Identifying Non-Manifold Edges in Composite Objects
This is all fine, but sometimes I create a few objects, change their colors around, and miss some objects that are touching when I turn them into composite objects. I know I need to union them -> but often I miss this detail when I'm swapping colors around and moving them between composite objects
Is there any way to highlight/detect those in onshape? I can do it in my slicer later but I would personally love to have some way to highlight those in composite objects. I wouldn't want it to reject it in a composite object necessarily... but I would want to know about it. Maybe it should reject it though?
Re: Improvements to Onshape - January 31st, 2025
@NeilCooke graphics in What's new posts still not working in Firefox with default Enhanced Tracking Protection on but if you disable it (click on shield icon next to URL) the images and videos work again.

Re: Improvements to Onshape - January 31st, 2025
Actually it was related to tracking protection. They work on Standard but I apparently had it on Strict.
Re: Large tile layout challenge
The add option in all feature creation tools simply requires parts to be touching and not necessarily intersecting.The edges of your Asher base pattern are missing half the grout to complete that pattern and allow that add function to do its thing. I may play with your file for my own study and share it to demonstrate some "cleaner" ways to do what you need next time.
In Revit you can explore those mitered areas with ease. I'm not familiar with chief architect.. It would not be a 3d visual of a tile/grount pattern but it would get the job done with a 2d pattern filling any surface you need it to with the ability to move and rotate the pattern as you see fit.
Did some performance testing on your file and discovered a significant performance hit when using a 2nd direction with the pattern part add feature. There's about a 200% hit in performance of that feature vs just using 2 separate part pattern adds. Only tested using your file. I'm interested to see if its consistent, and if so that's definitely something to be mindful of
