Cat gears key chain.

thingiverse

Create a cat-themed key hanger with planet gears by printing an upside-down knob and three small gears, then modifying the GCode to add the knob to the center gear during printing. Slice the case with a pause for inserting the gears and knob+center gear. Design and print took a full day; ensure proper bridge printing at thin layers. Share your creation with someone to spread happiness - it's more rewarding to give prints away. Print at 0.1mm layers, and be cautious with gear sizes to avoid breaking them during assembly. Your Marlin firmware should have an M0/M1 stop command for LCD panel assistance in inserting parts.