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Print-In-Place 7-Link Track Strip
A 7-link, 12 mm-pitch print-in-place track strip, 28 mm wide and about 92 mm long, for the 'N20 Twin-Track Mini Tank Chassis' kit. Print 8 and join 4 into each 28-link loop. Each link has 8.4 mm knuckles and an integral 4 mm pin running in a 5 mm teardrop bore, plus a 5.6 x 7.6 mm window that the 12T sprocket teeth drive through. The strips join with M3x8 SHCS inserted from each track edge, passing through the last link's 3.4 mm bore and threading into the first link's 2.6 mm self-tap pilot.
Snap-Link Robot Tank Track
A six-link print-in-place tank track for small tracked robots and rovers: 16 mm pitch, 30 mm wide pads, 4 mm integral hinge pins in 5 mm bores (0.5 mm clearance everywhere), 106 x 30 x 10.5 mm per strip. Each clevis has a snap mouth that opens upward so printed strips push together into any length loop while track tension pulls against solid bore wall, and a center guide horn keeps the belt on a twin-wheel bogie; knuckles engage a 16 mm pitch sprocket.