This model will need to be printed in 7 separate jobs for a bed size of 250x210(Prusa MK3).
The blue face, and eye parts have short pegs on the back to fit into the orange part, you can secure them with super glue.
The blue parts and orange parts have chamfers to make it easier to superglue them together. The only parts that don't need to be super glued are the actual holders on either cheek, these slide into the bracket.
Once everything is super glued, you can you command strips or whatever wall mounting mechanism you want on the rear of both orange cheeks as these are what will hold the weight of the paper towel.
As for print setting, I have accounted for tolerances, and the only supports you should need are for the bracket mounts on both orange cheeks(orange_part_2 & orange_part_3). Resolution should probably be 0.15-0.20, and I wouldn't go over 0.3.
If I have time I'll print it and add pictures here.
The author marked this model as their own original creation.