Step 13.54 — Scrub inside PRINT_START, then shut down¶
Step 54 of 54 · Chapter 13 — Initial startup
(no image — see text)
Parts: none.
Do: In PRINT_START, insert the three lines below after QUAD_GANTRY_LEVEL, above the existing G28 Z. SAVE & RESTART, print one small part and watch the scrub, then commit and shut down as before.
G28 Z ; provisional, tip not clean yet
NOZZLE_PARK_BUCKET
NOZZLE_CLEAN
Check
The tip leaves the brush clean, the string lands in the bucket, and the first layer matches the cube's.
What you're looking at
The scrub runs after QGL at the QGL temperature, between a provisional Z home and the one that counts. The nozzle probe measures the real tip, so a clean tip is a true Z zero.
Caution
The nozzle is at 150 °C during the scrub. Keep hands off the toolhead, and empty the bucket only cold, lifting it off its magnets.
Good stopping point · ~30 min since the last one
the scrubber runs inside PRINT_START, the config is committed and copied off the Pi, and the machine is shut down. Ready for Checkpoint 13, then Ch 11 Part B.
Source: Printables 796563 — macro placement · Ch 12 Step 12.36