I made a hand rest with a few buttons for my SpaceMouse Wireless. "Adafruit ItsyBitsy 32u4 - 5V 16MHz" was used as the board. For the other boards with "ATmega32u4" chip pay attention to the PIN assignment!
I tried to create the parts separately, then you can change something as needed and continue to use the rest. The palm rest is available in two variants: with and without leather. On the lid, I also glued leather between the lid and the cap with the logo.
It's a bit tricky with the cables, but doable ;)
The code is also included and can be loaded with Arduino IDE, for example. Buttons can be assigned individually in the code. The current assignment is shown on the display.
The parts were printed with Artillery Hornet and SUNLU PETG Filament.

I hope you will like it. Have fun :)

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Short video on YouTube:
https://youtu.be/n-Ef7bRfj98

SpaceMouse:
https://3dconnexion.com/de/product/spacemouse-wireless/

Parts:

• Adafruit ItsyBitsy 32u4 - 5V 16MHz - ATmega32u4 onboad Chip
• 1.3 inch OLED Module SPI 128X64 Display
• 9x 12mm High Round Push Button Switch LED - Momentary Reset
• 2x 12mm Push Button Switch LED - Latching fixed lock
• 2x M4 18mm
• 1x M3 12mm

Links:
Board - https://www.berrybase.de/adafruit-itsybitsy-32u4-5v-16mhz
Buttons - https://de.aliexpress.com/item/32896467643.html
Display - https://de.aliexpress.com/item/1005001621782442.html

Artillery Hornet