This paper towel holder fits the US General single drawer service cart. It may or may not fit other models. It features arms that will swing down as the roll gets smaller taking up less space. The spindles are held into the arms with 6mm x 4mm magnets. There are holes for 6 magnets on each side, but I found 3 to be sufficient for now. The arms are held to the brackets with ¼-20 x 1.0 hex bolts and lock nuts. No supports needed for any of the parts.
Brackets: I suggest PETG as they need to flex onto the side of the cart. Once on they slide behind the legs to lock in place. Print with enough walls to make the top and bottom parts solid. Print one LH and one RH. Note that the second photo does not have the final version of the brackets.
Arms and Spindles: PLA or PETG. You'll need two of each.
I've included the Fusion file as well as a Step file if you feel the need to modify it.
The author marked this model as their own original creation.