I wanted to have paper towel holder that slides in the slot on the side of the bed. Easy to insert, no tools required.
You will need two side pieces( printed mine without top/bottom layer and kept just the hex infill) and two pieces for the steel holder.
I used 6x1mm aluminium tube, cut the size you want.then you can just plug each end and use a M4 screw(quite tight, but with hex drive, easy peasy).
Printed in PETG with 0.3mm layer.
Update 18.07.2022
I added a “reworked” version of the side brackets. I noticed that when the paper towel was becoming empty, it would start to unroll when having a window open. I've created this second version where the paper towel is coming toward the wall, locking the paper.
The author hasn't provided the model origin yet.