I should probably also update the build instructions for someone putting this together for a new kit. You'll need longer screws to mount the whole thing to the extruder. The kit from MakerFarm comes with (I think) M4x16mm socket-head screws for this purpose. You will need something longer, at least 25-50mm (1 to 2 inches, I need to check the size I used). In the US you can get metric sizes in longer screw lengths from your local industrial supply house or get #4-40 machine screws from Lowe's or Home Depot (Lowe's may have a slightly better variety of the #4 pan head machine screws in little plastic bags). #4 machine screws fit quite well in the holes on the extruder base (snug without deforming anything).