I can print with my Robo R1 Plus; however, the fan does not turn on and my prints are terrible on the back side. Steps I tried: 1) I removed the fan and used a 9 volt battery to see if the fan still works and the fan turns on fine. 2). I wiggled all the wiring to see if there was a wiring issue. I cleaned the contacts as best I could at both the board and wire connector. What else can I do, or is it a board problem? It's been running fine for 2 years and now all my prints suck.