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Four-Lane Hookup Wire Spool Cradle
A 140 x 70 mm bench caddy with four 32 mm lanes. Partial spools of 22–30 AWG hookup wire sit in a curved 44 mm-radius cradle, so they roll in place as you pull wire and don't need an axle, whatever the spool's bore. It takes spools up to about 85 mm across and 31 mm wide. Each lane has a front notch that feeds the wire forward, so loose spools stop unwinding into each other in a drawer.
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.