Step 08.17 — Close the extruder with the motor plate¶
Step 17 of 65 · Chapter 08 — Toolhead: Stealthburner, Clockwork 2, Revo HF, Nitehawk-SB V2
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Parts:
- the motor plate with its MR85 · already on the bench
- M3×25 SHCS ×2 · Fasteners, Tools & Misc box
Do: Bring the motor plate onto the main body so the shaft picks up its second MR85, then fit two M3×25 SHCS. Tighten until the parts meet, then stop. Tightened past that, the plastic bends and cracks.
Check
No visible gap at the parting line and no stress whitening at either bolt boss. The shaft still turns freely.
What you're looking at
The motor plate closes the extruder and picks up the shaft's second bearing. The manual's warning is exact: these two M3×25 pull two printed parts together, and past the point where they actually meet you are bending plastic rather than tightening a joint.
Source: SB manual p.23