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Ultimaker keychain gearbox

Simple key chain gearbox based on Tony Buser's dissolvable support gearbox. To be printed with support material that is dissolvable, e.g. with an Ultimaker 3.

You can modify the tolerances and such by opening the SCAD file in OpenSCAD.

Important variables you can change are:
- shell_radius = 25;
- ring_radius = 2.1;
- gear_height = 4.5;
- gear_cutout_height = 6;
- gear_z_gap = 0.5;
- case_fillet_mm = 1;

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