# How do I handle filament runout / switching rolls mid-print?

These PLA rows list 190–230 °C (374–446 °F).

On the Prusa XL thread, the printer kept going because the filament sensor was likely off. Recalibrate it, then preheat and push the new filament through the nozzle. The other four threads are a model, a stopped extruder, a snapped hotend, and an ABS bed.

Check the filament sensor before you change a slicer setting. On the only runout in this set, the XL kept printing air. [Clogs](/answers/clog), [under-extrusion](/answers/underext), [AMS](/answers/ams), and [MK4 filament](/answers/mk4_filament) cover the failures the other threads actually show.

## The XL

[r/prusa3d 1hps0qb](https://www.reddit.com/r/prusa3d/comments/1hps0qb/) is a Prusa XL print that continued with an empty nozzle. The score-50 comment says the sensor is likely off, and if it is on, recalibrate it. The same comment says preheat and push the new filament through. Expect clicking, because the nozzle is still full. A score-10 comment has done that push-through on an MK3 or MK4. A score-7 comment says the sensor stays off after an unloaded-filament prompt until it is turned back on. A score-7 comment also counts two sensors, one at the tube entrance and one above the gear. The [XL](/printer/prusa-xl) page is the printer record. The [MK4S](/printer/prusa-mk4s) page is the other Prusa record.

The [MK3 non-S filament-sensor article](https://help.prusa3d.com/article/filament-sensor-mk3-non-s_2125) says a runout pauses the print, unloads the last centimeters, and prompts for a new spool. If a piece stays in the PTFE tube, the article says push it out with the new filament. That article is the MK3 non-S sensor. It is the manufacturer page that matches the comment. It is not an XL procedure.

## The other four threads

[r/BambuLab 1i3f59y](https://www.reddit.com/r/BambuLab/comments/1i3f59y/) is a bend-mid-print model. The title says it reduces filament swaps. The score-18 comment asks to make a YouTube short. A score-5 comment asks for a poker-chip version. There is no sensor step in the retrieved comments.

[r/ender3 13j4ucp](https://www.reddit.com/r/ender3/comments/13j4ucp/) is Elegoo PLA that stops extruding partway through a long print. The poster already replaced the nozzle. The score-8 comment asks about heat creep. The score-6 comment asks about extruder clicking and says a 0.8 mm layer on a 0.4 mm nozzle is the odd setting. A score-5 comment asks about a tangle. [ELEGOO PLA](/brand/elegoo/pla) is the named spool.

[r/BambuLab 11g424j](https://www.reddit.com/r/BambuLab/comments/11g424j/) is a hotend that snapped. The post says PA12-CF was left inside the part. The score-19 comment talks about press-fit nozzles and a dye test for cracks. That is a hardware break.

[r/3Dprinting 1n76prc](https://www.reddit.com/r/3Dprinting/comments/1n76prc/) is Polymaker Polylite ABS releasing from PEI on a P1S. A score-6 comment says 90 °C (194 °F) is too low for that person's ABS and uses 110 °C (230 °F). A score-10 comment wants a brim, a clean bed, and a warmer chamber. [Bed adhesion](/answers/bed_adhesion) is that failure.

Updated 2026-10-18. Sources accessed 2026-10-18. Use case: Troubleshooting.

## Ranked filaments

| Rank | Filament | Nozzle | Bed | Price per kg |
| --- | --- | --- | --- | --- |
| 1 | ELEGOO PLA | 190–230 °C (374–446 °F) | 35–65 °C (95–149 °F) | — |
| 2 | Prusament PLA | 205–225 °C (401–437 °F) | 40–60 °C (104–140 °F) | — |
| 3 | Bambu Lab PLA Basic | 190–230 °C (374–446 °F) | 35–45 °C (95–113 °F) | — |

## What the community says

r/prusa3d 1hps0qb is a Prusa XL that kept moving after the filament ran out. The score-50 comment says the sensor is probably off, or it needs recalibration, and says to preheat and feed the new filament through the nozzle. A score-15 comment says the sensors are off. A score-10 comment has pushed filament through on an MK3 or MK4. A score-7 comment says dismissing an unloaded-filament error leaves the sensor off. r/BambuLab 1i3f59y is a bend-mid-print model. r/ender3 13j4ucp is Elegoo PLA that stops extruding. r/BambuLab 11g424j is a snapped hotend with PA12-CF still in the part. r/3Dprinting 1n76prc is Polymaker Polylite ABS letting go of a PEI bed.

## Sources

- [Prusa Knowledge Base, filament sensor MK3 (non-S)](https://help.prusa3d.com/article/filament-sensor-mk3-non-s_2125) (manufacturer)
- [Prusament PLA Jet Black](https://www.prusa3d.com/product/prusament-pla-jet-black-1kg/) (manufacturer)
- [ELEGOO PLA 1.75 mm](https://us.elegoo.com/products/pla-filament-1-75mm-colored-1kg) (manufacturer)
- [Bambu PLA Basic technical data sheet V3.0](https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_PLA_Basic_Technical_Data_Sheet_bf3411ce-be39-4db7-9669-1b4671d2196b.pdf?v=1734060943) (datasheet)
- [Community source, r/BambuLab 1i3f59y](https://www.reddit.com/r/BambuLab/comments/1i3f59y/) (reddit)
- [Community source, r/ender3 13j4ucp](https://www.reddit.com/r/ender3/comments/13j4ucp/) (reddit)
- [Community source, r/BambuLab 11g424j](https://www.reddit.com/r/BambuLab/comments/11g424j/) (reddit)
- [Community source, r/3Dprinting 1n76prc](https://www.reddit.com/r/3Dprinting/comments/1n76prc/) (reddit)
- [Community source, r/prusa3d 1hps0qb](https://www.reddit.com/r/prusa3d/comments/1hps0qb/) (reddit)

HTML: https://filamentfacts.com/answers/filament_runout