Cherry MX Keycap Tolerance Test 3D Printer Model Free Download

Description Files (25)

Summary

This is a tolerance test design in Fusion 360 for my Cherry MX keycap generator CAD designs:
https://www.thingiverse.com/thing:4387400
https://www.thingiverse.com/thing:4397194

This design uses the following base dimensions for the + shaped switch stem from Cherry MX official drawings:
Width: 4.1mm
Thickness: 1.17mm

The final width and thickness of the stem hole is calculated with a parameter called MXHoleTolerance which widens the stem hole in the keycap slightly.

Instructions:

Print a range of test pieces with varying tolerances. For SLA printers, around 0.05mm seems to work well, for FDM printers maybe over to 0.1
Try inserting them onto your mechanical switches and find the one with the best fit
Open the Keycap generator (links above), go into MODIFY -> Change Parameters and change MXHoleTolerance to the value listed on the print with the best fit
Use the keycap generator to create and print the keys of your dreams

Note: even FDM printers only have an accuracy around 0.05mm so there will always be variation. If you are getting inconsistent fitment, try turning on anti-aliasing in your slicer (in Chitubox this is in Settings -> Advanced) and try rotating models 45 degrees on the XY plane so the straight lines go diagonally across the screen's pixels. I would also suggest getting some fine diamond-coated needle files to adjust keys that are too tight.

MX_Tolerance_-0.02mm.stl	126.4KB
MX_Tolerance_0.02mm.stl	167.5KB
MX_Tolerance_0.04mm.stl	139.9KB
MX_Tolerance_0.06mm.stl	190.1KB
MX_Tolerance_0.08mm.stl	202.0KB
MX_Tolerance_0.12mm.stl	131.1KB
MX_Tolerance_0.14mm.stl	103.6KB
MX_Tolerance_0.16mm.stl	153.8KB
MX_Tolerance_0.18mm.stl	165.7KB
MX_Tolerance_0.1mm.stl	100.9KB
MX_Tolerance_0.2mm.stl	125.7KB
MX_Tolerance_0mm.stl	137.2KB
MX_Tolerance_Split_-0.02mm.stl	134.9KB
MX_Tolerance_Split_0.02mm.stl	176.0KB
MX_Tolerance_Split_0.04mm.stl	148.2KB
MX_Tolerance_Split_0.06mm.stl	198.4KB
MX_Tolerance_Split_0.08mm.stl	210.3KB
MX_Tolerance_Split_0.12mm.stl	139.2KB
MX_Tolerance_Split_0.14mm.stl	111.7KB
MX_Tolerance_Split_0.16mm.stl	161.7KB
MX_Tolerance_Split_0.18mm.stl	173.6KB
MX_Tolerance_Split_0.1mm.stl	109.0KB
MX_Tolerance_Split_0.2mm.stl	133.6KB
MX_Tolerance_Split_0mm.stl	145.7KB
MX_Tolerance_Test_v7.f3d	223.3KB

Cherry MX Keycap Tolerance Test 3D Printer Model

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