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How To Make a Cubic Frame (by Alex Landherr)
I've tried making a cubic frame by first sketching a square and then extruding it to form a cube.

Then I've on the top face/side drawn another square and extruded it so that it's extruded as a difference all the way through to the opposite side.

When doing the same for the other faces in order to make a cubic frame and then exporting it as an .stl-file there warnings about triangles and self-intersections.

The export itself goes well but when my slicer (PrusaSlicer) tries to repair it instead of some sections looking like a cuboid it's more like a weird prism.

How should I go about it?
Fri Nov 12 2021, 16:24:43
(no subject) (by Tom)
I just tried this, and I think you're hitting bugs in the NURBS Booleans, maybe due to the coincident planes when you do the last cut. It works to draw the frame additively, or the subtractive method works if you force NURBS to triangle mesh.

NURBS problems are pretty common with coincident curved surfaces. I'd never seen them with coincident planes before, but I think you do have them here.
Fri Nov 12 2021, 18:43:37
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