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BackVCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, needing only one side to a D-shaped hole, set this to a D-shaped shafthole if desired. Scale([engraved_indicator_scale * 0.3, engraved_indicator_scale * 0.3]) union() { cube([board_width, board_height, thickness]); cylinder(thickness+standoff_height, r=standoff_radius, $fn=360); cube([cutout_width, cutout_height, thickness+3]); cylinder(h=thickness+standoff_height+3, r=hole_radius, $fn=360); vertex 0 -6.2584 7.81508 facet normal 4.273030e-001 1.192914e-003 9.041077e-001 facet normal 0.188081 -0.291196 0.937993 facet normal 0.297059 -0.243768 0.923219 facet normal 0.780265 0.0331712.
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