Printer worked within an hour out of the box. Some problems encountered only after about 20 hours of total printing: The print shifted almost an inch about 2 hours into a 6 hour print. After checking on YouTube, it appeared that the x-motor power input was way too low which was likely causing the plate to not advance at one point. We reset it by adjusting the pot to about 3 times the voltage and it appears to be working ok now. This is something Tevo should check before sending the printers out. Also thinking about adding auto-leveling. The software could be upgraded to show the time left to print, rather than the time printed so far. Other than those few things, so far, so good considering the bargain price.