AnswerTroubleshooting
What happens if retraction distance is too high?
Soft filament is pulled up into the heatbreak and jams, the gear grinds it, and lines restart with gaps. Bambu Lab and Prusa's MK3S cap it at 2 mm.
Tagged “hotends”
AnswerHardware
What does the part cooling fan do?
It cools plastic leaving the nozzle so it sets before the next line lands, making bridges, overhangs and fine tips work. Base PLA profiles run it at 100% after layer 1.
AnswerTroubleshooting
Why is my 3D printer leaking filament around the nozzle?
The nozzle is not sealed against the heatbreak. Reseat it, then tighten it hot: E3D says 285 °C and 2 Nm for a brass V6 nozzle, Prusa 280 °C and 2.5 Nm on the MK3S.
AnswerTroubleshooting
What does the heating failed error mean on a 3D printer?
The hotend warmed too slowly after a heat command, so the printer halted. Marlin 2.1.1 and later want 2 °C in 40 s. A damaged or loose heater cable is the usual cause.
AnswerTroubleshooting
Why does my Bambu printer say the hotend cooling fan speed is abnormal?
The hotend fan is too slow or stopped (HMS_0300-0300-0001-0001). Clear strings, reseat its 4-pin plug and retest at 51 °C: the fan runs above 50 °C.
AnswerTroubleshooting
Why does Klipper say extrude below minimum temp?
Klipper blocks every extruder move while the hotend reads below min_extrude_temp, 170 °C by default. Usually a macro extruded before M109 finished heating.
AnswerTroubleshooting
What is a MINTEMP error, and is it dangerous?
MINTEMP is a safety shutdown: Marlin trips below 5 °C, usually from an unplugged or broken thermistor wire. What to check, including a Prusa MK4 after a nozzle swap.
AnswerTroubleshooting
What causes a thermal runaway error on a 3D printer?
A heater stayed below target too long (Marlin: 4 °C for 40 s). Usual causes: a loose thermistor, heater or wiring fault, fan on the block or untuned PID.