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Top of photo attached show using a "V" drill bit on CNC for a beveled angle Bottom shows 3D printed beveled angle.
I had a hell of a time designing a beveled angle using 3D printing software. There's probably an easy way to do it. For my use I found making a solid like a cone and doing a Bollean difference with a square is one way of creating beveled edge on inside like a TV mask.
This is Similar in construct to creating a mold. I've thought for TV knobs it might be easier to 3D print a mold then pour resin into the mold and then do the back of the knob part in the mold.
I use free software: Meshlab, Meshmixer, Blender and some free online Cad program such as tinker CAD. I also use some 3D scanning software.
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