Dryboxes for your MMU2S you can print on your i3

Print instructions

I do not share .gcode because you can use either PET-G or PLA (do not use ABS/ASA due to shrinkage).
Use 0.3 mm Draft profile in PrusaSlicer, vase mode for covers.
The only thing you should change in the settings is bridging angle.
Set it at 45 degree.
Fix frames on Prusa`s spool holder with hot glue or silicone.
Place bags with silica gel inside each drybox.