About this 3D model

This thing goes in place of the original wooden axle end of the ultimaker inside the body. It can hold the 2x M3 nuts so it's a lot easier to fix the part (no more need to hold the nut with a twizzer or nut holder). The hole in the center is also a little wider in order to limit friction on the bearing. Works great in conjunction with thing 54075 for the outside.