10-penny propeller spinner
thingiverse
Set your slicer to pause at precisely 3mm. Insert 9 pennies with care, taking note that improper seating can cause serious damage to your print head. Resume the print process immediately. Drive a penny firmly into the slot located at the bottom of the device. Proceed to activate the spinning mechanism. I conducted one trial run and observed that it spun continuously for 1 minute and 19 seconds.
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