Pitch 24.8 mm is tight (fuse body is 19 mm). Tighten one nut at a time; drop a way if you want wrench room.
Drill plan
Punch through the plastic, then drill the copper off the holder so the hex pockets stay clean. Bolts come up from below.
- 01
2 mm stock is electrically fine (88 mm²) but floppy — the holder web carries the clamp load.
- 02
Print with the underside on the bed so the hex pockets open onto the plate.
- 03
Punch or spot-drill the copper through the plastic, then drill the bar off the holder so you don't chew the holes.
- 04
PETG, ABS/ASA or nylon — not PLA. 4+ perimeters, ≥40% infill.
- 05
Common MEGA: 32 V DC, 2000 A interrupt. 58 V / 1000 A parts exist for 48 V — read the stamp. DC only, not a Class-T.
- 06
M8 spec is ~12 N·m. Recheck after the first heat cycle — the clamp web creeps, and a loose nut is a hot joint.
- 07
A Belleville (disc spring) washer under the nut, against the copper or fuse pad — not a split lock washer. It stores clamp as the print creeps. Keep the pad-to-copper stack metal-to-metal.