1 Piston Solenoid engine
thingiverse
This is a one Piston Solenoid engine with the solenoid to the side and if you leave the print scale how it is you will need 3 Ball Bearing with a bore diameter of 5mm, an outside diameter of 16mm, and a width of 5mm, and a kill switch and insulated copper wire and 9mm wide weights / 9mm bullets - got them at the gun range/ heaver objects work better in this scenario like led.
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