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Batch B04 — XY joints + X carriage

One page per step

Read this chapter one step per page — big pictures, prev/next, and the same tick marks. This page is the whole chapter in one scroll.

Revali watching a first layer
Joints and a carriage. Every part here has a bore, and every bore has strong opinions.

Time: 8.6 h (1 plate) — PrusaSlicer 2.9.6 estimate.

Sessions: 1 plate start (~5 min hands-on, 8.6 h unattended) + ~15 min inspect and bin.

Prerequisites: Gate B passed (Step B00.7 — the printed bores and the insert bosses; the caliper and insert rows run early, on what is already on the bench). B02 (accent [a]_endstop_pod_D2F_switch, cable bridge) feeds the same assembly chapter and printed two batches ago. B03 is not a print prerequisite — the two batches only meet at Ch 04/05.

Printed parts

STL Repo path Qty Colour g ea Bin
xy_joint_left_lower_MGN12.stl Voron-2 STLs/Gantry/X_Axis/XY_Joints/ 1 Black 32.0 05-XY
xy_joint_left_upper_MGN12.stl Voron-2 STLs/Gantry/X_Axis/XY_Joints/ 1 Black 11.7 05-XY
xy_joint_right_lower_MGN12.stl Voron-2 STLs/Gantry/X_Axis/XY_Joints/ 1 Black 32.7 05-XY
xy_joint_right_upper_MGN12.stl Voron-2 STLs/Gantry/X_Axis/XY_Joints/ 1 Black 11.1 05-XY
x_frame_V2TR_MGN12_left.stl Voron-2 STLs/Gantry/X_Axis/X_Carriage/ 1 Black 17.1 07-X
x_frame_V2TR_MGN12_right.stl Voron-2 STLs/Gantry/X_Axis/X_Carriage/ 1 Black 17.2 07-X
probe_retainer_bracket.stl Voron-2 STLs/Gantry/X_Axis/X_Carriage/ 1 Black 0.5 07-X

Probe retainer bracket, conditional

only used with the Omron inductive probe. Costs 0.5 g — print it, decide later. If the probe barrel measures 9 mm rather than 8 mm on arrival, print probe_retainer_bracket_9mm.stl instead (verify on arrival).

Hardware: none.

Read first

  • Checkpoint after B04: caliper the printed M3 holes now; the real MGN12 carriage screw pattern is tested against x_frame_V2TR_MGN12_* on kit day, before any heat-set goes in.
  • Most commonly reprinted here: xy_joint_*_lower_MGN12.
  • x_frame_V2TR_MGN12_* are the R2/Clockwork-2 carriage halves — LDO Build Notes p.129-130 warn specifically about using the wrong X-carriage variant here.

Step B04.1 — Filament prep

Do: Galaxy Black, spool #1 after B03. The ledger has 328 g on it at the start of this plate and 211 g after, so no spool change here.

check Check

Clean purge; ≥117 g on the spool.

Source: print plan §4.3 — spool changes · 00-slicer-setup § Drying · Prusa KB — ASA

Step B04.2 — Load plate B04-P1

Sorting diagram, drawn from the committed project: every part numbered and filled in the colour of its bin, bin id on the part; the legend reads # · STL · bin (chapter · steps). Sort at Step B04.6.

Do: Open slicer/plates/B04-P1.3mf with File → Open Project. Arrangement, per-object brims and overrides are already in the project, so confirm it loaded rather than rebuild it. No rotation, no brim: the preview shows no brim outline. Parts: all seven — 8.6 h, 117 g (PrusaSlicer 2.9.6 estimate); xy_joint_left_lower_MGN12; xy_joint_left_upper_MGN12; xy_joint_right_lower_MGN12; xy_joint_right_upper_MGN12; x_frame_V2TR_MGN12_left; x_frame_V2TR_MGN12_right; probe_retainer_bracket.

check Check

The plate holds x_frame_V2TR_MGN12_left/right, not the superseded Superceded_Parts/MGN9_X/x_carriage_frame_*_MGN9 files.

Helper: Counts the parts on the sorting diagram and checks the total against the object count.

Source: print plan §3 — the batches · 00-slicer-setup § Committed projects · 00-slicer-setup § Orientation & brim · print plan §6 — conditional / verify items

Step B04.3 — Pre-print checks

Do: Sheet per 00-slicer-setup § Print sheet, chamber preheating.

check Check

Chamber ≥40 °C; Settings → Chamber Filtration reads Adv. Filtration.

Source: 00-slicer-setup § Print sheet · 00-slicer-setup § Calibration sequence · Prusa KB — ASA

Step B04.4 — Print

Do: Print with standing overrides.

check Check

First layer clean on both XY joint lowers, the largest parts on the plate.

tip Tip

Paused or stopped mid-plate? See When the printer stops.

pause Good stopping point · ~5 min since the last one

plate started; nothing to do until it finishes.

Source: 00-slicer-setup § Overrides · print plan §4.1 — how these numbers were produced

Step B04.5 — Inspect

Do:

  1. Now: caliper each xy_joint_*_MGN12 half's four M3 holes, 3.40 mm, 15.0 × 16.0 mm apart.
  2. Now: caliper the carriage halves' M3 holes, 3.40 mm.
  3. Kit day: offer the real MGN12 carriage up before any heat-set.

check Check

Every M3 hole reads 3.40 mm ±0.10 and the two carriage halves close with no gap.

pause Good stopping point · ~10 min since the last one

holes calipered and the halves separated again; no inserts set, and the real carriage is a kit-day row (Ch 05 sets the inserts).

Source: print plan §5.2 — checkpoint after each batch · 00-slicer-setup § Calibration sequence · LDO Build Notes / FAQ

Step B04.6 — Sort into bins

Do: Sort off the plate diagram: number to legend, colour to bin, bin id on the part. Mark plate id and date on a hidden face. Labels: bin-labels sheet. Keep probe_retainer_bracket loose until the Omron barrel diameter is confirmed.

B04-P1

bin parts off this plate
05-XY — XY joints, endstop pod, upper Z belt clips xy_joint_left_lower_MGN12, xy_joint_left_upper_MGN12, xy_joint_right_lower_MGN12, xy_joint_right_upper_MGN12
07-X — X carriage halves, probe bracket, cable cover x_frame_V2TR_MGN12_left, x_frame_V2TR_MGN12_right, probe_retainer_bracket

check Check

05-XY: four joint halves plus the pod and bridges; 07-X: two frame halves and the bracket.

Helper: Reads each bin label aloud and checks the count against the diagram.

pause Good stopping point · ~10 min since the last one

the plate sorted into 05-XY and 07-X, bin ids on the parts. probe_retainer_bracket stays loose until the Omron barrel is measured; no inserts set.

Source: print plan §9 — batch summary · print plan §2 — which parts gate which step · print/README § Bins

Checkpoint B04

  • Gate B passed before B04-P1 started
  • Printed M3 holes in both XY joints and both carriage halves caliper 3.40 mm ±0.10
  • (kit day) MGN12 carriage screw pattern confirmed against x_frame_V2TR_MGN12_left/right before heat-sets
  • (kit day) Omron probe barrel measured (8 mm vs 9 mm) — correct probe_retainer_bracket variant confirmed
  • Confirmed X-carriage is x_frame_V2TR_MGN12_left/right (V2TR/Clockwork-2), not the superseded MGN9 carriage
Revali passing a gate
Batch B04 printed: plate 8 of 22, 65.8 of 157.0 h. 1 gummy worm.

Common mistakes

  • Grabbing a superseded MGN9 X-carriage file by mistake — LDO Build Notes flag this explicitly. V2TR is the right file: it is the carriage shared by the V2 and the Trident.
  • Committing heat-set inserts into the carriage before the real carriage has been offered up on kit day.
  • Reaming a printed hole instead of calipering it and fixing the profile.

Next

Assembly: Gantry (p.82–107). Printing: B05 — Z joints + Z chain.