Free 

MUBI Logo and Keychain
You can print multi color keychain with a single nozzle (use this video for reference) or using multiple extruders, palette, etc.
I also add a design for dual color logo and keychain, just use Cura's pause at layer tool or color change in PrusaSlicer.
I recommend 2mm for base and 1mm for top but you can re scale it however you like.












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