Having built a H1 I'm looking at building a second printer of my own design. My plan was to machine all of the parts from Aluminum, however I thought I'd print a test part to see if it was feasible just to print the parts.
The intent was for a press fit and I was somewhat surprised that's what I got.
I used octagons rather than round holes based on this HydraRaptor: Polyholes
I'm impressed with just how useful this tech can be.