3 Interlocked Helical Gears

myminifactory

I created this after watching the Numberphile video "3 Gears are Possible." Seeing his helical gearbox inspired me to build one myself. This design is optimized for FDM printers. To assemble, simply print: 1x Gearbox Bottom @ .30mm layer height; 1x Gearbox Top @ .30mm layer height; 3x Helical Gears @ .10mm layer height; and 6x Twist Pins @ .30mm layer height. Apply a small amount of superglue around the edge of one twist pin, insert it into a helical gear after placing it in the box. Assemble the last gear outside the box, then place it in the frame before putting on the top. Secure the lid with a small amount of superglue at each corner to seal the box.