Ch 035 / 20
Step 03.5 — Verify the thermal fuse (do not fit one)¶
Step 5 of 20 · Chapter 03 — Build plate
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Parts: none.
Do:
- Find the 125 °C thermal fuse on the bottom face by the cable exit.
- Confirm its body is pressed flat to the aluminium, its single screw and washer tight.
- It is wired in-line with one heater lead.
Check
Fuse flat to the plate, screw tight, no strain on either leg of the fuse where it joins the heater wire.
What you're looking at
Manual p.56, the fuse installation you skip. The thermal fuse is a one-shot cut-out that opens permanently at 125 °C, wired in series with one heater lead, so a runaway heater loses supply. It works only pressed flat against the aluminium. See the glossary.
Caution
Rev D+ / LDO: SKIP manual p.56 entirely — the fuse is pre-installed. Inspect only; the page's M3×12 SHCS and M3 washer are not needed. src
Source: Voron manual p.56 · LDO Build Notes (Rev D)