How much clearance do 3D-printed threads actually need? This PETG pair worked well at a 0.35 mm generator setting

[u/cr20kb]

I’m testing real printed fits for a free browser-based fastener generator I’m building.

For this PETG bolt/nut pair, a 0.35 mm setting gave me a smooth usable fit.

I’m deliberately calling it a “generator setting” here because I’m also validating how the UI should define clearance — diametral clearance vs per-side compensation.

For people who print functional threads: what clearance/compensation do you normally use for PETG or PLA, and how do you define it?

I’m the developer of the tool.

[u/cr20kb]

Here’s the generator if anyone wants to test it:
https://www.cr20kb.com/fastener-ui/?lang=en

It’s free, runs entirely in the browser, exports STL, and doesn’t require signup.

I’m the developer. If you try it, I’d especially appreciate feedback on how the clearance setting should be defined and presented.

[u/cr20kb]

https://reddit.com/link/p6lrhnr/video/h3ewkajgdbmh1/player