About this 3D model
The sleeve was originally created by 3dprintler for the 3dponics project. I noticed that this would work well with a hanging mount I had already created for my balcony so I combined to two of them. The pieces can fastened together with a screw and nut. I also created a shortened version for those of us with a smaller print bed (r1). A big thanks to 3dprintler for posting the original sleeve design! Hopefully some other users can make use of this modification.