Step 14.34 — Test the fan by target, then on a hot chamber¶
Step 34 of 36 · Chapter 14 — Calibration and tuning
Parts: none.
Do:
- Send the first three lines: air blows out of the housing, then stops.
- Door shut,
M140 S110; logchamber_temponce settled, up to 45 min. - Send the next two; the fan runs, then stops. Send the last two.
SET_IDLE_TIMEOUT TIMEOUT=7200
SET_TEMPERATURE_FAN_TARGET TEMPERATURE_FAN=exhaust_fan TARGET=15
SET_TEMPERATURE_FAN_TARGET TEMPERATURE_FAN=exhaust_fan TARGET=0
TURN_OFF_HEATERS
SET_TEMPERATURE_FAN_TARGET TEMPERATURE_FAN=exhaust_fan TARGET=45
SET_TEMPERATURE_FAN_TARGET TEMPERATURE_FAN=exhaust_fan TARGET=0
SET_IDLE_TIMEOUT TIMEOUT=1800
Check
The settled chamber is still in the 50–60 °C band, and at ceiling 45, bed off, the fan runs and stops near 43 °C.
What you're looking at
With a ceiling set, the fan starts 2 °C above it and stops 2 °C below, reading the toolhead's chamber sensor. The bed is the heat source, and the soak also proves the closed housing does not cost ASA its chamber band.
Exhaust fan — switches at its ceiling, and ASA still soaks — the calculator needs JavaScript; the limits are in the table on this page.
Caution
The bed reaches 110 °C. Hands off the plate until it reads under 40 °C again.
Good stopping point · ~35 min since the last one
the exhaust in printer.cfg, the fan proved by target and on a hot chamber, heaters off, ceiling 0, idle timeout back at 1800.
Source: Klipper docs § SET_TEMPERATURE_FAN_TARGET · Klipper temperature_fan.py § watermark · Ch 14 Step 14.8