Skip to content
Ch 08Checkpoint

Checkpoint 08 — bench test before anything is powered

Checkpoint · Chapter 08 — Toolhead: Stealthburner, Clockwork 2, Revo HF, Nitehawk-SB V2

What you should have now — The Stealthburner body, Clockwork 2 extruder and Revo HF hotend, hung on the X carriage. The stock CAD also shows an ADXL mount; yours has none. Nothing here is size-dependent. The CAD toolhead is the stock Voron one: no Nitehawk-SB V2, no LDO chain anchor.

Do all of this with the printer unplugged. It is the last chance to find a toolhead fault cheaply; after Ch 10 the bay is closed and after Ch 13 a wiring error costs a component.

  • Heater resistance. Across the two HE0 ferrules: a low, stable, non-zero reading. A 60 W 24 V Revo HF cartridge is roughly 9.6 Ω (24²/60); anything near 0 Ω is a short and anything open is a broken lead. (verify against the value E3D prints on your cartridge)
  • Heater isolation. No continuity between either heater lead and the heatsink, the nozzle, the frame, or the toolboard GND pad.
  • Thermistor at room temperature. Across the TH0 pigtail: about 100 kΩ at 25 °C for the Semitec 104NT-4-R025H42G. Warm the HeaterCore with your fingers and watch the resistance fall — an NTC that rises is the wrong part or a bad connection.
  • Probe. Continuity from each PROBE pin to the matching probe wire; no continuity between 24V and GND.
  • LED chain. No short between 5 V and GND at the chain connector; continuity along the chain in the order logo → right → left.
  • Fan orientation, checked visually. The hotend fan's moulded arrow points into the heatsink and its wires exit at the top. The 5015 discharges down into the ducts. Both impellers spin freely with a finger flick and no rub. Powered spin-up is confirmed in Ch 13 Verify Fans.
  • Fan-voltage jumpers. V_HEF and V_PCF both on 24 V, nothing cut, nothing bridged to 5 V.
  • Fan ports. Axial on P2, blower on P4, LEDs on P3. If the wrong fan spins in Ch 13, fix it in the config, not by re-crimping — see Common mistakes.
  • Board-to-board header fully seated, SB front snapped on with no gap at the parting line.
  • Mechanical. Extruder shaft turns freely by hand; gear mesh has a faint play; tension arm swings; latch closes; filament runs from the CW2 inlet through the PTFE to the nozzle with no catch.
  • Probe height still ~6 mm below the plastic and the insulation intact, front and sides only — set in Ch 07 Steps 07.34–07.37, re-checked at Step 08.55.
  • Cable discipline. Run X to both extremes by hand — the parked umbilical never goes taut, nothing rubs a belt, nothing touches the nozzle. The secondary USB port is still reachable. (Chain slack and the chain ties are Ch 10 Steps 10.59 and 10.66.)
  • The toolboard-to-motor ground wire (Steps 08.43 and 08.53) is fitted per LDO's ESD Hardening section, or — if the kit is missing the grounding cables — logged as an unanswered #ldo_motors question. Do not let Ch 10 close the bay with this unresolved.
Revali passing a gate
You built a complete toolhead, wired and hanging on the X carriage. 10 gummy worms.

Common mistakes

  • Assembling before the insert pass. A missed insert in the CW2 main body or motor plate means stripping the extruder back to bare plastic and re-melting brass into a part that already has a bearing and a gear train in it. Do Steps 08.3–08.7 first, every time.
  • Forcing a JST-PH2.0 plug into the wrong header. The PH2.0 bodies on PROBE, TH0, CT and XY ENDSTOP are small and similar, and the Rev D guide's XH2.5 text sends people looking for the wrong connector. Read the silkscreen before every insertion.
  • Pressing the board-to-board header home when it will not go. The V2 interface is keyed and gender-reversed against every Rev D photo. If it resists, it is backwards. Pressing harder bends pins and the damage is not visible once the body is on.
  • Overtightening the tension-arm or motor-plate bolts. The tension arm's M3×25 is a hinge pin; torque it and the extruder cannot tension filament. The motor plate's M3×25 pair will crack the main body if you keep turning — the manual's own advice is to bin the part and reprint.
  • Skipping the strain-relief bend on the Revo. If the strain relief is not bent clear, the nozzle cannot be fully hand-tightened into the heatsink, and you get a molten-plastic leak at the first hot print.
  • Building Klicky because the parts are on the bench. They are printed as a future option. The kit's config, wiring guide and pre-terminated cable are all for the inductive probe; mixing the two costs you a probe recalibration and a set of macros you do not have yet.

Next

Ch 09 — Electronics bay. DIN rails, the Leviathan and its voltage-selection jumpers, the Pi, and the USB adapter you bagged in Step 08.64 — including the frame-side leg of the grounding scheme.

← PreviousStep 08.65 — Return to the printer manual

Next →Ch 09 — before you start