I've been recently building a 3D printer and I'm having issues testing it.
This is my hardware:
- RAMPS 1.4
- Arduino Mega 2560
- 4x Pololu Motor shields A4988
- 1x Nema 17 extruder
- 2x floppy stepper motor
- 1x DVD stepper motor
- Generic hotend with 0,4 mm nozzle
Then I assembled everything and I started testing... I tried the 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 Pronterface; it showed hotend temperature stuck at 150°C, but the hotend was not hot. Moreover the motors would not move.
I also tried Repetier host and it returned an M999 error without any further explanation.
I had no problem installing firmware on the Arduino and the fan of the hotend is working. I also tried changing baud rate but it seemed not to work.