# Extruder temperature failure

I've never made solid prints since I purchased a TEVO Tarantula in December 2019, but since I'm totally new to this sport, I didn't realize I had an issue until after many failures. I kept upping extruder temperature and nothing seemed to change, parts printed but fell apart. Using a hand held temperature gauge to check bed and extruder (on the sensor screw), bed temperature was perfect, extruder only warm, stepping 10 degrees Celsius at a time (200, 210, 220, 230, 240, 250 °C) always resulted in 18.3 °C/65 °F

I looked for broken wires on extruder heat and sensor, but they were okay. TEVO support thinks it's a sensor problem, but it won't arrive for 1 month or more. I purchased a spare extruder from AliExpress when I bought the machine and replaced the complete unit but now I get an error E1 Heating Fail, Printer Halted.

• Hi and welcome to 3DPrinting.SE! – 0scar Jan 7 at 14:12
• What sort of extruder did you buy? Does it have a similar temperature sensor (PT-100 or an NTC resistor)? Note that some sensors have a different number (heat-up table) assigned in the firmware, you could have a wrong sensor. Have you tried to power the heater cartridge directly on the Power Supply Unit to see if it heats up at all? What I find strange is that it prints, but it is weak, filament cannot be extruded under 170 °C, so if it got extruded it got hot, possibly you've got thicker filament in the slicer than you have. – 0scar Jan 7 at 14:21