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I disagree about the stock controller on the DIY "giving up". I've had mine for going on a year now of nearly daily use without any serious issues. Also, there isn't any reason for the stock board to die quicker than an arduino / ramps setup. I recommend keeping the stock board and spend time using and learning about the printer. Then you can make informed decisions on what improvements should be made now, later, and what isn't needed. Now, if the controller does need to be replaced, I would not buy a new replacement from Colido since they are too expensive.

As far as the printer not doing anything:

  1. What is displayed when getting printer information (Alt-I) ?
  2. What do the logs say? Normally G commands are the only things logged but you can enable informational, warning, and error output also.
  3. It can be useful in troubleshooting communication problems to use the "screens" program included in Apple IOS. You can open the USB port and issue G command to the printer outside of Repetier, Cura, or other applications.