Thermistor for Prusa MK3/MK3S hotend (head) - Prusa PSA-13632

Replacement thermistor for the Prusa MK3 and MK3S hotend provides accurate temperature sensing for the nozzle assembly. Designed to function as a direct spare or repair component, this thermistor restores reliable thermal feedback to the printer’s control system, ensuring consistent extrusion and temperature regulation during printing operations.

Advantages

The thermistor offers precise and stable temperature measurement tailored for Prusa MK3/MK3S hotends, maintaining compatibility with the printer firmware and connector layout. Its compact design allows straightforward installation in the hotend block, and the component is suitable for long-term use as part of routine maintenance or after a malfunction of the original sensor. Using a dedicated Prusa-compatible thermistor reduces the risk of temperature-related print defects and supports accurate PID control.

Suitable for

• Replacement of a faulty or worn thermistor in Prusa MK3 and MK3S hotends
• Repairing temperature sensing issues that cause inconsistent extrusion or temperature readings
• Spare-part inventory for 3D printer maintenance and service
• Restoring correct thermal feedback after hotend servicing or nozzle replacement

Key specifications

• Type: NTC thermistor optimized for 3D printer hotend temperature measurement
• Compatibility: Designed for Prusa MK3 and MK3S hotend assemblies
• Form factor: Small, insulated sensor element suitable for insertion into the hotend block
• Connection: Wire lead matching Prusa hotend connector and wiring layout
• Function: Provides feedback for temperature control and PID regulation during printing

How to use

Turn off and unplug the printer before starting any repair. Remove the hotend assembly according to the manufacturer’s service instructions and access the thermistor pocket in the hotend block. Carefully extract the old thermistor and insert the replacement sensor ensuring the sensing bead sits correctly in the pocket. Route the wire leads following the original cable path and reconnect to the printer’s thermistor connector or board header. Reassemble the hotend, secure all fasteners, and power on the printer. Verify correct operation by performing a temperature reading and running a heat-up test to confirm stable readings and expected PID behavior.

Usage recommendations

Use the thermistor specifically for Prusa MK3 or MK3S hotends and follow Prusa’s service manual for disassembly and reassembly steps. After installation, run an initial temperature calibration or PID tuning routine if recommended by the firmware to ensure optimal temperature control.