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A closed-loop encoder tower that bolts to the rear face of a NEMA 17 stepper (42.3 mm plate, 31 mm M3 pattern, 24 mm boss clearance) and holds an AS5600 magnetic encoder board 26 mm above the faceplate — right over a 6 mm diametric magnet glued to a standard 24 mm shaft. The deck carries eight 2.9 mm M2.5 holes on 19 mm and 29 mm square patterns so most breakout boards land centred, with a 12 mm sensor window and 12 mm side openings for the cable and a hex key.
A four-link cable drag chain with an integrated M3 mounting foot, printed fully assembled — no pins, no clips, no post-assembly. Each 32 mm link carries an 11 mm wide x 13 mm tall cable channel and an arc-slot bend limiter that stops the chain dead straight and allows 35 deg of bend, so the top run won't sag. Overall 170 x 29 x 16 mm; the foot takes two M3 screws on a 19 mm spacing.
A 62 mm square, 19 mm tall adapter that lets a NEMA 17 stepper bolt into a machine face drilled for NEMA 23 — the base carries the 47.14 mm M5 pattern, the raised Ø52 tower carries the 31 mm M3 pattern with a 22.4 mm pilot register for the motor's centring boss. The hollow Ø30 core clears a shaft coupler, a 14 mm side window gives Allen-key access to the coupler set screw, and counterbores in the base bottom fully recess the four M3x20 motor screws so the adapter still seats flat.