TAZ3

Current problem: We think the thermal resistor (heater) in the extruder is broken.

Maintenance and repair guide from vendor: https://ohai.lulzbot.com/project/Budaschnozzle_resistor_thermistor/maintenance-repairs/

Reproduce:

• Start preheating
• *Head does not become hot*
• After some time "ERR: temp min" displayed on the LCD

What works:

• Thermistor (temperature sensor): Head temperature is measured correctly and displayed on the LCD
• PSU and mosfet: LED02 flashing on the RAMBO board during preheating
• Cables: the pair of red cables have ~12V on them during preheating

Documentation:

Thermal resistor page on Lulzbot (vendor) website: https://www.lulzbot.com/store/parts/heat-resistor

Same on Ali Express: http://es.aliexpress.com/item/Original-VISHAY-SFERNICE-RB57-7W-75R-resistor-free-shipping/1971677003.html?spm=2114.10010408.0.41.3SY9HG&isOrigTitle=true

Support page: https://www.lulzbot.com/support/heat-resistor

Part datasheet: http://www.vishay.com/docs/50008/rwm.pdf

Forum 1: http://shop.prusa3d.com/forum/prusa-i3-kit-building-calibrating-first-print-main-f6/extruder-not-heating-t331-s10.htmlForum

2: https://forum.lulzbot.com/viewtopic.php?t=2399

Warning: Heat resistor cannot be soldered, only with special solder and tools. Climping is the alternative solution using a ferrule: https://en.wikipedia.org/wiki/Ferrule

We looked at other thermal resistors too:

http://es.aliexpress.com/store/product/Heat-Resistor-4-7-Ohm-suit-for-Budaschnozzle-v2-3D-printer-sprinkler-head/1051583_1995934327.html?storeId=1051583

http://www.amazon.com/HICTOP-Pieces-Cartridge-Heater-Printer/dp/B014YB9M86