Easy Swap Paper Towel Holder

This simple paper towel holder is designed to be mounted hanging, e.g. on to the bottom side of a wall cupboard. As the holes in the parts suggest, you can use flat (countersunk) screws for mounting. When the movable part A is mounted to a bottom surface, the movable part B can be slid onto it. Part A has little bumps where part B has little slots to gently click in.

Another way of using this design could be mounting on a vertical surface (i.e. to a wall), with the paper towel roll being held horizontally or even vertically, with the stationary part at the bottom end and the movable parts on the top.

When printing, I recommend printing the hook-parts exactly the way the stl models are oriented (see slicer screenshot). This way, the layers are oriented optimally for strength. In that orientation, the movable part B needs supports. I recommend organic supports that originate on the build plate (instead of elsewhere on the part), so there is no material left that would later block the sliding parts. The slicer screenshot gives a suggestion of how the movable part B can be printed.

Obviously, the flat head screws' heads need to sink entirely into the chamfered holes of the movable part A. If they do not, they block the sliding.

I also provided the gcodes for the MK3/S/S+ using PETG. Be aware that the gcodes for the hook parts also feature an embossed PETG recycling symbol (which you might be able to see on the photo of the movable hook part - if you have a bright screen and look closely).