This is a remix of Splashdown's thumbwheels:
When I printed Splashdown's, it came out all crazy. I should have checked my slicer(S3D) before printing. The nubs around the outside were disconnected from the rest of the model. Also, the nuts fit very loosely. I measured the nuts I had and they measured at 5.5mm flat to flat rather than the 5.97 as Splashdown modeled. I edited the model to fit the nuts I had and ran the model through netfabb to correct the nubs slicing weird in S3D. It is also noteworthy that this model won't work with nyloc m3 nuts as they are too tall.
I printed this in ABS and with 3 walls/perimeters.
Stopping the print at 3.6mm to add the nuts was perfect as the next layer started laying down on top of the nuts. The plastic doesn't stick to the cold nuts, but I let it go and it came out fine. Just had to clean up some strings across the hole openings.