@Jason_Smith Yeah, I did 1.5X on mine. It made the features more reasonable.
BTW, I didn’t like his sharp edged in the model. SO I remodeled from scratch and added fillets. If you want to check it out the file is here in a few formats.
https://drive.google.com/folderview?id=1QszFvylHqf68g5WDbcr5qtQho-sTrRFa
Not exact 1:1, I took some liberties while modeling.
@Eclsnowman google drive link no work 
i would be game to print one for funzies… i need a torture test. no multicolors look possible with single extruder
@Dennis_P hmm the link on my end works. I will paste the link again below:
https://drive.google.com/folderview?id=1QszFvylHqf68g5WDbcr5qtQho-sTrRFa
I think I am finally getting dialed in- Modeled and made a spindle nose protector for the lathe. 1-1/2x8 internal threads,~2" OD knurled body, 1/4" spanner hole. It fits snug, good enough for light work.
@Dennis_P Looking good. Your ability in openscad is impressive. I have never been able to learn it. I am far more point and click.
@Eclsnowman What you don’t see is all the wood chips from all the hacking at it that I have done! I am by no means proficient, but OpenSCAD feels kind of natural coming from ACAD/lisp. Threads and knurls seem to be taxing on the rendering on my workstation. The final print was after making 2, 1/2" tall threaded check rings to get the tolerances and dimensions spot on. I ended up adding 0.2mm clearance to get the register diameter and the threads to compensate for dimensions. I could do better I think with the slicer and calibration. .
.15 to .2 is a pretty standard fit for printed parts. That’s my default tolerance for a good robust fit with enough wiggle room to not be a pain. Now when you get to stacking tolerances… that’s another matter. But a .2mm fit leaves room for some die swell, filament diameter variation, perimeter start scars, etc.
Jeeeees
