Step 02.09 — Install the remaining three Z rails¶
Step 9 of 44 with a helper · Chapter 02 — Z drives, Z idlers, Z rails, deck panel
Tap to enlarge
Gather for this segment — steps 02.09–02.10 (~35 min)
Fasteners, Tools & Misc box
- M3×8 SHCS ×27
- M3 roll-in T-nut ×27
Linear Rail Kit box
- MGN9H 400 mm rails ×3
Printed parts
z_rail_stop_x4×4 · bin 02-Z0, 02-Z1, 02-Z2, 02-Z3
Parts:
- MGN9H 400 mm rails ×3 · Linear Rail Kit box
- M3×8 SHCS ×27 · Fasteners, Tools & Misc box
- M3 roll-in T-nut ×27 · Fasteners, Tools & Misc box
Do: Repeat Steps 02.06–02.08 on the other three verticals. Each rail faces the other rail on its own side: front-left faces rear-left, front-right faces rear-right. Keep the same 3 mm bottom gap and holes 2–18 on all four.
Check
Four rails installed, the two rails on each side pointing at each other, all four bottom gaps equal, every carriage taped and running smoothly.
Helper Tape-marks holes 2, 4 and on to 18 on each rail before its screws go in.
What you're looking at
Manual p.27: all four Z rails on their verticals. Read the graphic for the mounting face, not the pairing. The two left rails face each other across the machine's depth, and the two right rails do the same.
Caution
Manual p.27 says only "make sure the rails face each other as shown in the graphic" and leaves the pairing to the drawing. The official CAD at the pinned commit de7e89d says every Z rail's mounting face is normal to ±Y: the two rear rails face forward, the two front rails face rearward. Corrected 2026-09-05. src
Tip
The CAD is the 250 machine: MGN9 300 mm rails on 430 mm verticals. Yours are MGN9H 400 mm on 350 verticals; the mounting face is the same.
Source: Voron manual p.27 · CAD-render pilot §8 — Z rail orientation · Voron-2 CAD Voron_2.4r2_Assembly_STEP.zip @ de7e89d · CAD: Voron 2.4r2 STEP @ de7e89d