Frequently asked questions
Which Prusa printers is this heatsink thermistor compatible with?
Compatible with Prusa MK4, MK4S, MK3.9, MK3.9S, CORE One, CORE One+, and CORE One L. Not compatible with XL, MK3.5, MK3.5S, MK3S+, MK3, MK2.5S, MK2.5, MINI, MINI+, MMU3, SL1S, HT90, or INDX.
What is heat creep and how does this thermistor prevent it?
Heat creep is the undue transfer of heat from the hot zone to the cold zone of the hotend, causing clogs. This thermistor monitors the heatsink temperature in real time, allowing the firmware to detect and alert to heat creep situations before they cause failures.
What is the difference between this thermistor (90 mm) and the 115 mm one?
The 90mm one is for the Nextruder heatsink (prevents heat creep). The 115mm one is for the hotend (monitors extrusion temperature). They are two sensors with distinct functions in the same printer.
Where can I find the installation manual?
The repair manual is available at help.prusa3d.com — select your specific printer model to access the correct hotend thermistor replacement guide.