Tank track system
thingiverse
Trench Track System for SLA Printer This track is designed specifically for use with a SLA printer, but if you want to print it using an FDM printer, be sure to over-scale the track for optimal results. The sprocket is printed using FDM technology and features a hole that accommodates a 6mm D-shape motor. When printing the sprocket, it's essential to scale it to 97.5% due to the retraction characteristics of UV resin. To build this system, you'll need 2.5mm steel rod, which I've successfully used by replacing welding rod (available for approximately $25 per 23 meters).
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