Regarding tolerances, I think it’s best to ask the print service.
For FDM I would not worry about shelling the part since this is done very efficiently in the print software.
If it has to be printed in resin, you can use the new Shrinkwrap command in Rhino 8. It is very quick.
Look here: Never fail shelling with Shrinkwrap in Rhino 8
And in this topic:
Rhino 8 Feature: ShrinkWrap - Serengeti (Rhino 8 BETA) - McNeel Forum