Logitech MX Mechanical Key Caps - All Keycap Sizes

The original MX Mechanical keycap and the other 7 sizes for the remaining 18 keycaps.
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updated December 24, 2023

Description

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The original model was perfect for the 92 base size keys, but the other 18 keys all had additional sizes. Popped off measured and tested all of the other sizes and they all fit and work. Caps was the most tricky, but what Ive got here fits just fine.

Unfortunately no good way to get that nice top curve from the original caps when using two colors so I didn't  try modeling that in.  

Print at 0.12 or less layer height for best results. 0.4 nozzle or less recommended. I let it print at normal speed and didn't have any issues but I think a little slower might be best for the dual color printing I show here.

Notes of which size is for what key:

Key countModelKeysKeysKeysKeys
88key_1A-Z,0-9F1-F14Numpad #'setc…
7key_1.25L/R CTRLL/R STARTL/R ALTFN
2key_1.5TAB\  |  
1key_1.75Caps   
4key_2BackNumpad 0Numpad +Numpad Enter
2key_2.25L ShiftEnter  
1key_2.75R Shift   
1key_6.25Spacebar   

Though the names are in u sizes these are not mathematically the exact u sizes. All are in the Logitech measured sizes off the actual keycap measurements. See this chart for differences

 Mathematical Sizes mmActual keycap Logitech Sizes mm
1u1818
1.2522.522.75
1.52727.5
1.7531.532.35
23637
2.2540.542
2.7549.551.4
6.25112.5118

If you need the mathematically sizes keycaps I can look into it.

My test were all done using 2 color printing on my Bambulab X1C. The lights are always above the center of the key so you need to position the color element where it will be lit for best results. I always cut out the letters, then put them back in and paint them in the slicer using the bucket tool on the top and bottom so the color goes all the way through. I thought I would need see-through PLA, but the solid red PLA I used lights up pretty good too.

I did not upload the keys with the words\letters in them. If that is really desired, I can look into it. I think I need to make some adjustments in font and sizes to fit best, thought I'm happy enough with most of these. (not sure what happened to space and Numpad enter could be cleaner)

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Model origin

The author remixed this model.

Differences of the remix compared to the original

Larger key caps using original model as source. Had to add properly positioned triple post for all large keys and special posts for Caps keycap.

 

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