Hi,
As the web speakes about one of the best 3D printers, i take my chances. After building / adjusting / leveling i started to power it up, no program was loaded, hmm strange. After loading "Marlin's firmware', it became alive. Adjusting the potmeter at the back of the display gave better results 
. But after 20 seconds the trouble started. The display and led6 on the board starts to blink. No usb connection can be made. Someone have experience with this? In the meantime i ordered a new arduino mega board :(