If you have the 2014 model of this printer you know the design is poor... I have replaced almost all the parts, now my printer is perfect. Designed to reuse all the existing components. The hot end mount is designed for the e3d V6 hotend chinese clone. For the X-carriage I bought 2 bearings SC8LUU (the same as the Z axis) and replaced the 2 SC8UU short bearings.I will upload some pictures and a video of my printer.