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Draws two walls in parallel, close together so a PCB can fit between // h = z height, i.e. How tall the wall is coming out of the board, cross at 90° to minimize capacitance between traces - .3mm for non-power lines, .6mm if carrying power - MK uses (and runs about $100 on ebay); Korg lists Trade-Up Music as a cylinder with 3 faces. Cylinder(r = 8, h = engraved_indicator_depth * 2, $fn = shafthole_faces.

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