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Re: Best way to place a construction line from offset of circle centre to circumference?
The slot tool is convenient, but you can also just sketch some lines and arcs with the right parallel and tangent constraints and get the same result. There are so many different ways to sketch this.

Re: How to export curved planar surfaces of model as DXF files for plasma cutting?
Thanks to the whole Onshape team for the new analysis tool.
I have been waiting for this for years.
I did not need such a powerful tool, something simpler would have made me happy and your great community. But I understand your actual professional compromises.
Re: qCreatedBy(sketch_id, EntityType.EDGE) returns more edges than I drew
Since you are talking about edges I'll assume you've used qCreatedBy(sketch_id, EntityType.EDGE)
. Sketch creates wire bodies corresponding to sketch curves, but also sheet bodies imprinted on plane (only if there are closed regions). You can use qCreatedBy(sketch_id, EntityType.EDGE)→qBodyType(BodyType.WIRE) to get only wire edges.

Re: POST /elements/copyelement/{did}/workspace/{wid} return Bad Request
Intersting, I kept getting a "Bad request" which tells me something else is going on. I created a copy of the workspace and tried just manually copying and pasting the element and got the following
So there might be something wrong with the Part Studio itself. Upon looking at the FeatureScript for that Part Studio (right click on the part studio > Show code) I can see that the FS version is really out of date so that might have something to do with it.
Try deleting the document, then restoring it from the trash, then going into it should prompt you to update the version of the standard library. Doing that fixed it for me.
Re: Curve pattern with spacing on alternate axis challange
Could you not just linear pattern a sketch (with "reapply features")
https://cad.onshape.com/documents/083e2b7118ddf51fc6731038/w/1fa376e66b89f5578f63e4d4/e/b470624373dd051f6181916c?configuration=Instances%3D9.0%3BLG%3D0.14300000000000002%2Bmeter&renderMode=0&tangentEdgeStyle=1&uiState=675790f794604078bab73067
Re: Missign references - floating and unattached red coincident icon
The red icon has lost reference. it stays in view as indicator of problem.
Look at feature tree and see where the warnings and errors start. The previous feature would be a likely suspect. First option is undo. If you notice a problem that may be very time consuming to fix. There is an option to go back via the version and history tree to before this happened. Select make a version. Select the versions one at a time until you arrive before the the error then select main. Right click on good version and select restore to main.
In this sample a line was deleted in sketch 1 that caused a cascade through everything else. Step one is undo. If not noticed for some time then use longhand version of undo via history tree.