Step 14.7 — Rotation-distance check (100 mm extrusion)¶
Step 7 of 36 · Chapter 14 — Calibration and tuning
(no image — see text)
Gather for this segment — step 14.7 (~20 min)
Tools and consumables
- masking tape
- steel rule
- digital caliper
- Prusament ASA, loaded
Parts:
- masking tape · consumable
- steel rule · tool
- digital caliper · tool
- Prusament ASA, loaded · consumable
Do: Heat the hotend to the ASA print temperature of 260 °C with filament loaded and the extruder engaged. Repeat 13.40's measurement once, caliper rather than rule on the remainder: tape at the 120 mm mark from the extruder entrance, then
M83
G1 E100 F60
Check
R reads ≈20 mm, so the extruded amount is within 0.5 % of target: 99.5 to 100.5 mm. Record it in the tuning log.
What you're looking at
rotation_distance is millimetres of filament per motor revolution. The measurement is indirect: the rule reads the remainder, not the amount extruded. Ch 13 Step 13.40 owns it; this is the refinement pass, now that the extruder has run a print.
and measure from the extruder entrance to the tape — that reading is the remaining distance R. [extruder] still carries the max_extrude_only_distance: 150 from 13.40. If the result is outside 0.5 %, apply 13.40's formula (new = old × (120 − R) / 100, using the value currently in the config), test it live with SET_EXTRUDER_ROTATION_DISTANCE EXTRUDER=extruder DISTANCE=<value>, and when it lands write the final number into [extruder] rotation_distance and RESTART. Never put 22.6789511 back — it is the Clockwork 2 starting point, not a calibration.
Good stopping point · ~20 min since the last one
rotation distance measured, iterated and written into [extruder], and Klipper restarted on the new value. Unload or park the filament; do not leave the hotend hot.
Source: Voron startup wizard § Extruder calibration (e-steps) · Ellis' Print Tuning Guide — extruder calibration · Klipper docs § Rotation distance · Klipper docs § SET_EXTRUDER_ROTATION_DISTANCE · Video: Part 9 @5:24:09