Compact Mk5 Extruder Heater Core

thingiverse

This modification aims to enhance heat transfer to the nozzle, ensuring better heater core insulation for efficient lower power heating and precise temperature control. Simultaneously, I am tailoring the extruder head to suit a CNC mill, increasing accuracy and build area. While my extruder operated on the bench, I focused on adapting the extruder controller to function with the CNC controller (Siemens Sinumerik). An update reveals successful re-coding of TechZone Extruder controller for extruder nozzle operation; a 3'44" warm-up cycle was measured, with continuous 28W heater power. However, some calculated power seems to be lost, and the reason is uncertain. In the heater core, four 10ohm ceramic wirewound resistors (RS part no 485-2669) are installed. These are glued using a calcium carbonate-filled epoxy resin mix. CPU paste was used to boost heat transfer during nozzle installation, and counter-boring the block provides insulation around the filament tube to minimize heat transfer upwards. The thermistor is installed, followed by taping resistor leads and soldering power supply cables outside insulation for enhanced temperature resistance.