Print with 1.2 mm layer height, 4 walls, 30% infill, no supports.

Some parts need to be cut flush in order for them to fit properly. There are some tight fits. If a fit seems loose then you can superglue. Don’t glue moving parts however. If parts don't fit then you can trim the part with a blade. There are some small bits in the model that serve as supports that need to be removed.