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Great, well detailed guide. Thank you.I had a question. I was wondering if I could make the printer run without the extruder and its parts. I am planning to simply attach a pen to draw onto paper on the platform. I have built the machine, but it will not print for me. I simply want to understand how the system works so that I can build a bigger one.Do I need to have an extruder for the printer to work? When I hit print on Proterface, I get the following error message:Error:Heating failed, system stopped! Heater_ID: 0[ERROR] Error:Heating failed, system stopped! Heater_ID: 0Error:Printer halted. kill() called![ERROR] Error:Printer halted. kill() called!