Heads up: many models on this page are AI-generated or uploaded untested. They may be misconfigured for the intended application — check the dimensions and tolerances, and verify or edit the model before printing or relying on it.*
Chamfered Polargraph Line Spool
A 42 mm dia x 44 mm line spool from the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). It has a 30 mm drum that takes up 94.2 mm of line per turn, a 5.2 mm bore for the NEMA17's 5 mm shaft, and a radial 4.0 mm bore for an M3 heat-set insert and set screw. A 2 mm anchor hole in the outer flange holds the line. Both flanges are 45° cones, so it prints without supports, and a hollowed core keeps it to about 25 cm³.
NEMA17 Spool Standoff Cage
This is the motor cage for the 'NEMA17 Hanging Wall Polargraph Drawbot' kit (print two). It has a 66 x 66 x 6 mm NEMA17 plate with four 3.4 mm holes on a 31 mm square for M3x10 screws and a 22.4 mm bore for the pilot boss. Four 12 mm posts, 55 mm tall, have 5.5 mm bores for M4 heat-set inserts and bolt to the Wall Backer Plate. They hold the stepper facing out from the wall and leave a 42 mm clear space where the line spool turns, with a web on the top side and the other three sides open.
SG90 Twin-Groove Tendon Spool
A two-groove tendon spool that screws onto an SG90/MG90S servo horn. It pulls a flexor line in one groove and lets out an extensor line in the other, so one servo drives a tendon finger both ways. It is 37 mm across and 22 mm tall, with 16 mm drums, a Ø7.5 mm bore so a screwdriver reaches the horn screw, a Ø9 mm recess for the horn hub, M2 clearance holes at radii of 12 and 15 mm on four arms, and Ø1.6 mm tie-off holes.