My guy downtown has consistent stuff vs the decorative guy up the road from my shop so I make the 2 hour trek downtown for it. I got hosed on a batch of the decorative stainless awhile back leving me with 18 meters on unusable stuff.
Printed holder for a bushing and a nema17 will be fine, a bushing will have significantly less weight than the roller bearings and assorted bolts on the MPCNC.
As far as friction goes, after a bit of work, it runs smoother than the china lm12uu I use on my printers.
I use wd40 dry Teflon from Ace hardware (yes there is ace and true value here)