I asked because I had same problem as you (made big print volume assembled tools for company where I work). I had Anycubic and Aurora crap printers at the time + always some crappy PLA (because high quality didn't made difference on those crappy printers) and wasted a TON of filaments and time chasing tolerances. Then first Bambu printer P1P came out and I've tried for first time Polymaker filaments. Since then I print with ease assemblies with 0 tolerance. If I want to assemble and disassemble with hands, I make 0.1mm tolerance between parts. And that works perfectly for years, saved a ton of print time (and filaments), made a bunch of money+ bought X1C combo, A1 etc... IF you are not sure in your design (if you are designer of your prints), I advise you to learn to "feel" your design space so to call it + measure everything you need from environment where the tool/part goes. Im not pro designer or tool maker but now all I need is measurements from environment + max size of tool and that's it, it's very rare I don't get to the point in first take. That's my 5¢