Before you start Chapter 09¶
Before you start · Chapter 09 — Electronics bay
Fits out the space under the deck panel: two DIN rails and the two printed B11 conduits that replace LDO's five wire ducts, the Meanwell 24 V PSU, the Omron SSR, the Leviathan mainboard carrying the Raspberry Pi 4B, the Nitehawk USB adapter, the mains inlet and WAGO blocks, and both endstops. Everything is mounted and nothing is wired — that unlocks Ch 10, which is one continuous harness job ending at Checkpoint #1.
What you're building in this chapter. The bay is the space under the deck panel, and this chapter fits it out without connecting a single wire. Two DIN rails — the standard 35 mm slotted steel rail that industrial gear clips onto — run left to right across the deck. Two printed conduits from batch B11 carry the harness Ch 10 will lay in: a DC loop round both rails, and a separate AC conduit that joins the mains WAGO bus, the SSR, the PSU and the bed-lead hole. They replace LDO's five PVC wire ducts (layout v3). On the rear rail go the PSU (the Meanwell supply that turns mains into the 24 V everything runs on) and the SSR (a solid-state relay: the contactless electronic switch that lets a low-voltage board turn the mains bed heater on and off). On the front rail go the Leviathan — this kit's mainboard, driving all five steppers, both heaters, the fans and the endstops, with the Raspberry Pi bolted on top of it — and the USB adapter that terminates the toolhead umbilical. Round the rear frame go the IEC inlet module (socket, switch and fuse in one) and three WAGO lever connectors that distribute live, neutral and earth. Both endstops — the nozzle probe that sets Z zero and the XY endstop PCB in its pod on the gantry — are built and mounted here too. Two bed-extrusion parts go above the deck, under the plate: the nozzle probe, on the right extrusion with its pin just behind the plate's rear edge, and the bed WAGO breakout on the left one, where the plate's own three leads end.
Left and right in this chapter are always the printer's own — the way you would say them standing at the front of the upright machine, display towards you. With the printer on its head, work from the printer's rear (the edge the deck notch points to — 09.4 — with the A/B motors hanging from the gantry's rear corners above it) and look down into the bay: the front edge is far from you, and your left is the printer's left. That is exactly the view in LDO's placement photo (display at the top of the frame) and in the manual's p.169/p.171 insets (labelled Front at the top). Stand at the front of the inverted printer instead and everything below is mirrored — and the bay is not symmetric.
Time: 3.0–4.5 h hands-on, first build (survey §7.2, plus the B11 conduits).
Sessions: 8 × ~30 min (first-build estimate; each Pause: line carries its own segment minutes).
Prerequisites:
- Ch 01–03. Frame squared, deck panel and deck supports in (manual p.28–30), build plate on with its three leads loose above the deck, none through it (Ch 03 Step 03.14).
- Ch 06. Gantry installed — step 09.33 mounts the XY endstop pod to it.
- Ch 08. The USB-adapter stack bagged at Step 08.64 is clipped on at 09.25.
- Batch B07 — Electronics bay + lighting. Plate B07-P1 carries
power_inlet_IECGS_1mm(moved out of B08 — index correction #11); the manual fits the inlet panel at p.156/167, i.e. in this chapter, so B07-P1 must be printed before you start or steps 09.10–09.12 stall. The COB light-strip mounts on plate B07-P2 are not consumed here; they are Ch 10. No part of B08 is needed in this chapter. - Ch 08's insert pass (optional). The inlet panel and the bed WAGO mount both need inserts before assembly (survey §5.2 W3); do them in the same iron session as Steps 08.3–08.7 so Steps 09.10 and 09.34 start with a confirm, or set them in-step there instead.
- Batch B11 — Bay ducting, all five plates. B11-P4 and B11-P5 print after the kit-day bay measurements (B11.10). An A/B motor lead that measures short at B11.9 gets a longer replacement lead; layout v3 stays. The
⚠ LDO layoutnotes below are only for a build without B11.
Tools
- 2.5 mm flat-blade screwdriver (supplied — this is the tool for every plug-type terminal in the bay)
- PH1 (M2 self-tapping) and PH2 (PSU and SSR terminals) screwdrivers
- Hex 2 / 2.5 / 3 mm
- Soldering iron + brass M3 heat-set tip
- Hacksaw or fine-tooth saw + file (DIN rail), side cutters or a fine saw (PVC wire duct, LDO layout or the fallback middle run only)
- Steel rule ≥300 mm, marker, digital caliper
- Multimeter (used properly in Ch 10; keep it on the bench from now on)
- Ferrule crimp tool, square, for VE0508: staged at 09.35, used only if a lead is re-terminated in Ch 10
Consumables: 3M VHB tape (supplied, for the printed conduits), IPA + lint-free cloth, masking tape and marker for labelling.
Printed parts
Parts arrive in the bins named below (see the bin map in print/README.md#bins); check the bin label's list before you start. No B11 lid comes out here: the AC lids wait in bin 10-lids-AC for Ch 10 Step 10.80, the DC lids in 11-lids-DC for Ch 11 Step 11.52.
| Looks like | STL | Bin | Qty | Colour |
|---|---|---|---|---|
Electronics_Bay/lrs_200_psu_bracket_x2 |
09-bay | 2 | Black | |
Electronics_Bay/wago_221-415_mount_3by5 |
09-bay | 1 | Black | |
Electronics_Bay/pcb_din_clip_x3 |
09-bay | 1 file = 3 clips (spares — kit supplies 4) | Black | |
Electronics_Bay/PSU_stabilizer_50mm |
09-bay | 1 — fit only if needed, see 09.16 | Black | |
Nitehawk-SB-V2/usb_adapter_mount_partial_cover |
08-CW2 | 1 | Black — fitted in Ch 08 Step 08.64, bagged with the adapter | |
Skirts/power_inlet_IECGS_1mm |
09-bay | 1 (batch B07-P1) | Black | |
B11 DC loop, 09.6: CMD_V3_1H_154mm_DUCT ×2, CMD_V3_1H_90DEG ×2, V2L_90DEG_MIRROR, V2L_58mm_DUCT ×3, V2L_130mm_DUCT, V2L_70mm_DUCT, CMD_Remix-V3_DUCT-2B_45deg ×2, V3L_10mm_DUCT |
09-ducts-DC | 13 | Black | |
B11 middle run, 09.6: V3L_154N_DUCT ×2, V3L_T_REG_N ×2, or B11's fallback set |
09-ducts-DC | 4 | Black | |
B11 AC conduit, 09.36: V3L_WIRE_BOX_PORT, V3L_90DEG_R15 ×2, V3L_34mm_DUCT_HOLE, CMD_V3_1H_T_SHORT, V3L_10mm_DUCT ×2, CMD_Remix-V3_DUCT-1M_ENDCAP ×2 |
09-ducts-AC | 9 | Black |
Supplied printed by LDO — do not print these: Leviathan Bracket Left ×1, Leviathan Bracket Right ×1, NH Adapter Mount ×1, DIN Clip ×4, LDO Nozzle Probe ×1, Bed WAGO Mount ×1. src
Hardware (chapter totals)
| Fastener / part | Qty | Note |
|---|---|---|
| DIN rail, 35 mm W, slotted | 2 | length not stated by the manual or LDO — (verify on bench) |
| DIN rail plastic end cap | 4 | 2 per rail |
| PVC wire duct, 20 W × 25 H | 5 | LDO layout only (3 across, 2 front-to-back). Layout v3 uses one, as the middle run, only if B11.10's gap row failed. Cut lengths (verify on bench) |
| M5×10 BHCS | 8 | 4 DIN rails, 2 mains WAGO mount, 2 bed WAGO mount |
| M5 T-nut | 4 | 2 mains WAGO mount, 2 bed WAGO mount (verify on bench for the bed WAGO mount) — the 4 DIN-rail T-nuts are placed in Ch 02 Step 02.11, 0 new here |
| M4×6 BHCS | 6 | 4 PSU brackets (verify), 2 SSR to its metal bracket |
| M3×8 SHCS | 8 | 4 Leviathan to brackets (verify), 2 inlet panel, 2 XY endstop PCB |
| M3×6 BHCS | 2 | 2×2 XH splicer PCB to the bed WAGO mount |
| M3×10 FHCS | 0 | p.156's two fix the filtered inlet; the IEC-GS module snaps into power_inlet_IECGS_1mm on its 1 mm tabs, no screws (CAD, STL) |
| M3×25 SHCS | 2 | nozzle probe to the bed extrusion — not the manual's M3×20 |
| M3×30 SHCS | 0: bagged with the pod at Step 05.46 | 2 fitted at 09.33, XY endstop pod to the gantry (manual p.164); counted in Ch 05's table |
| M3 T-nut | 4 | 2 inlet panel, 2 nozzle probe |
| M2×10 self-tapping | 8 (LDO's bag holds 24) | 4 DIN clips to Leviathan brackets (09.20), 2 the USB adapter's DIN clip (09.25), 2 Z endstop PCB (09.28) — the adapter stack itself is held by 3× M3×10 SHCS fitted in Ch 08 Step 08.64 |
| M3×5×4 heat-set insert | 5: 3 inlet panel + 2 bed WAGO mount | inlet panel: 1 in the rail's bottom face for the bottom-panel hinge (Ch 11), 2 in the cut-out for the p.222 belt guard (three Ø4.7 bores in power_inlet_IECGS_1mm.stl; p.156 draws five because the filtered variant adds two for its inlet screws); the mains WAGO mount has none, only two M5 holes |
| Meanwell LRS-200-24 PSU | 1 | 115/230 V selector switch on the side |
| Omron G3NB-210B-1 SSR | 1 | |
| DIN rail mount bracket for SSR, metal | 1 | off-the-shelf metal; there is no printed SSR mount |
| AC inlet, integrated switch & fuse | 1 | one module — not the manual's separate inlet + rocker |
| WAGO 221-415 (5-way) | 3 | mains distribution, L / N / PE |
| WAGO 221-412 (2-way) | 2 | bed WAGO mount |
| LDO Leviathan mainboard | 1 | |
| Leviathan Bracket Left | 1 | LDO-supplied printed |
| Leviathan Bracket Right | 1 | LDO-supplied printed |
| DIN Clip | 3 | 2 Leviathan brackets, 1 USB adapter; LDO ships 4, the 4th is a spare (LDO printed-parts guide) |
| Raspberry Pi 4B | 1 | reseller-optional line item |
| Raspberry Pi heatsink | 1 | |
| Pi standoff — from the Leviathan box | 4 | (verify on bench) |
| Raspberry Pi 3/4 HAT power adapter — from the Leviathan box | 1 | the Pi 5 adapter stays bagged (verify on bench) |
| XY endstop PCB | 1 | |
| Z endstop PCB | 1 | |
| 2×2 XH splicer PCB | 1 | bed thermistor breakout |
| LDO Nozzle Probe, collar pre-pressed | 1 | LDO-supplied printed; the collar is part of it (verify on bench) |
| Nozzle probe shaft, 5 mm | 1 | |
| M3×2 set screw | 1 | nozzle-probe collar, threadlocker pre-applied |
| Bed WAGO Mount | 1 | LDO-supplied printed |
Read first
- Remove every voltage-selection jumper from the Leviathan before it goes anywhere near the rail (step 09.19). Mixing voltages on the shared 24 V supply permanently destroys the controller and whatever is plugged into it. Jumpers go back in Ch 10, one at a time, after each component's voltage is confirmed. src
- Nothing is wired in this chapter. Mains wiring is the one step in this build that can kill you, and it is done as one deliberate sequence in Ch 10 that ends at LDO's Checkpoint #1 — continuity within each colour group, no continuity between L, N and PE, PSU selector confirmed, all with the cord unplugged. Leave the C13 cord in its bag. (survey §4.4 #8)
- The manual pages p.148–172 describe a different machine — a BTT Octopus, a mini12864, a 5 V PSU and a separate Pi bracket. Use them for the DIN-rail technique and the mounting geometry only; every part that differs carries a
⚠callout at its step. src - Do not close the bay. Skirts and the bottom panel go on in Ch 11, only after Checkpoint #1 passes. Fitting them now costs an hour of re-opening plus the safety check you skipped (survey §5.2 W8).
- Test-fit every roll-in T-nut. Extrusion and T-nut tolerances on this kit are tight; a forced nut galls the slot. src
- Bench-only work, good for a short session: 09.10 and 09.34's inserts, 09.14–09.15 (PSU selector and brackets), 09.17 (SSR on its bracket), 09.19–09.23 (Leviathan brackets, jumpers, Pi, HAT adapter), 09.25 (USB-adapter clip) and 09.27–09.29 (nozzle probe) need no printer. If you did the two heat-set jobs in Ch 08's iron session, 09.10 and 09.34 start with a confirm.
Sources for this chapter:
- Voron 2.4r2 assembly manual, p.148–172 — mounting geometry and DIN technique only; the boards on those pages are a different machine. Pinned at commit
de7e89d. p.28–29 supply the deck and DIN-rail pages - LDO wiring guide (Rev D) — the placement this chapter actually builds: General Placement, DIN rails and wire ducts, Preparing the inlet, Preparing the PSU, Preparing the mainboard, Assembling the nozzle probe, Wiring the bed heater, Checkpoint #1
- LDO Build Notes § Voron 2.4 build FAQ — every page in p.148–172 that this kit skips or replaces
- LDO Leviathan V1.3 board guide — voltage-selection jumpers and Pi mounting (link-only; no licence)
- LDO printed-parts guide (Rev D) and LDO 350 Rev D BOM — which brackets to print, what the kit supplies
- Nitehawk-SB V2 repo — the USB adapter stack and its grounding wire
- LDO XY-endstop repin guide — connector order on the XY endstop PCB
- Mirrored images in this chapter are LDO Motors' (docs.ldomotors.com, LDOVoron2, Nitehawk-SB V2), used with attribution; see
assets/remote/09-electronics-bay/SOURCES.txt
Video coverage (Steve Builds, pre-release LDO kit — differs from Rev D+): Part 5 @2:47:07 (+21m), Part 6 @1:30:45 (+12m), Part 7 @0:05:08 (+4m), Part 7 @0:24:27 (+9m), Part 7 @0:31:06 (+5m), Part 7 @0:35:54 (+20m), Part 7 @0:59:20 (+12m), Part 8 @0:31:02 (+23m), Part 8 @1:54:21 (+21m)
Helper steps: 13 · 09.2, 09.3, 09.4, 09.6, 09.7, 09.19, 09.20, 09.27, 09.28, 09.29, 09.30, 09.32, 09.33