or pay for an essay by cliking here, I think the second option will be better for you, as it will save you a lot of time.

@heartless - It's just SPAM

I can help you with the school project, I have been working in the field of education for a long time.

this is from 2 years ago. I think that perhaps they have things figured out by now

Hi! I've been recently building a 3D printer and I'm having issues testing it.
This is my hardware:
Ramps1.4
Arduino mega2560
4x Pololu Motor shields a4988
1x Nema17 extruder
2x floppy stepper motor
1x DVD stepper motor
Generic hotel with 0,4 nozzle
Then I assembled everything and I started testing... I tried ramps test code and it didn't work (motors did not move, but I'm sure they are ok), then I tried using marlin and interface; it showed hotend temperature stuck at 150 degrees, but the hotel was not hot. Moreover, the motors would not move. I also tried repetier host and it returned me a m999 error without any further explanation. I had no problem installing the firmware on the Arduino and the fan of the hotend is working. I also tried changing the baud rate but it seemed not to work. I need a quick help since this is a school project I need to have a working printer before next week (13 days max). I'm asking for a fast solution to this problem. Thank you in advance and sorry for my bad English.

I can help you with the school project, I work in the field of education for a long time. For a successful school project, you need to write an essay, you can write it yourself or pay for an essay by cliking here, I think the second option will be better for you, as it will save you a lot of time.

I'm almost certain you're trying to build the e-waste printer(https://www.instructables.com/id/Curiosity-120-eWaste-Educational-3D-Printer/)

Did you have someone/website provide the firmware, or did you just download marlin?

You'll need to tune the motor steps/mm before they move the correct amount.

Like carl_m1968 said, you most likely have the wrong thermistor type selected in the firmware.

I would agree, OP is this for sure what you're building? Your pics look very similar.

I also find it interesting they are using DVD motors, because they're really only designed to drive a laser which weighs less than what, 100 grams probably total? A flatbed scanner stepper motor (the one that moves the lens along the plane) would be far more appropriate, if the goal is to re-use parts.

I've seen videos of this thing in action, though, so the motors *do* work. I will throw in third on it being a thermistor type selection issue.

Did you have someone/website provide the firmware, or did you just download marlin?

You'll need to tune the motor steps/mm before they move the correct amount.

Like carl_m1968 said, you most likely have the wrong thermistor type selected in the firmware.

First and foremost though is get those motors changed to real printer motors NEMA 17.