Frequently asked questions
What Prusa printers is this sensor compatible with?
Compatible with Prusa MK4, MK4S, MK3.9, XL and CORE One / CORE One+ / CORE One L. Not compatible with MK3S, MK3S+, MK3, MK2.5S, MK2.5, MINI, MINI+, MK3.5, MMU3, SL1S, HT90 or INDX.
What is FLEX Mode and when should I use it?
FLEX Mode temporarily disables the sensor via a physical switch for printing flexible filaments like TPU, which can trigger false filament runout positives during printing.
Does the sensor pause or cancel the print when the filament runs out?
Automatically pauses printing and waits for the spool to be changed, allowing you to resume without losing progress. It doesn't cancel the print — simply change the filament and continue.
Where can I find the installation manual for this sensor?
The repair manual is available at help.prusa3d.com — select your specific printer model to access the correct step-by-step guide.