When I saw Anwira's https://www.prusaprinters.org/prints/15619-cotton-pad-dispenser, I printed it but then wished it to be mountable onto my future Prusa MK3S, since I use these pads to degrease the print surface. I modeled it after Anwira's idea with somewhat thinner walls.
It can be mounted behind the Z-axis-top-right part, using a longer screw for the left one. As can be seen in the photo, I made an opening for the wrench socket that I have to tighten the M3 nut. The dispenser sits just above the PSU.
It is made in 2 different heights:
-) 107 mm - this one ends with the top end of the Prusa frame
-) 160 mm - this one extends longer and has more capacity
Be warned, some people might find it dangerous to mount combustible material above the PSU which may produce flames if faulty.
Rotate by 270° around the x-axis, and print without support.
15% infill seems enough.
I used PETG, but PLA should be suitable as well.
The author remixed this model.