Printer auto-leveling stopped working all of sudden and only worked when it wanted. I've lost tons of material and couldn't proper configure it. I've contacted the manufacturer support through e-mail and facebook community, no one was able to work me through the configuration. In the rare instances where the nozzle don't hit the heatbed, it jams and destroy the print result. The extruder keeps jamming and I think it's contributing to jamming the nozzle (even after configuring it's spring). Asked for a refund and the seller never responded. Aliexpress refunded my order.