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HELP: Threaded hole printing too large/loose (self.help)

submitted 1 month ago* (last edited 1 month ago) by RenegadeSC to c/help

8 comments fedilink hide all child comments

Tested a print of a muzzle device after calibrating some PLA Pro. The print came out looking great. However, the 1/2x28 threads in the ID are very loose, so much that with minimal force, you can pull straight past them.

So, I've seen a few different ways to fix this, but I wanted to see what the community agrees to as the "best" practice to adhere to.

Do I adjust for shrinkage, add in additional tolerance in the modeled threads, or do something else entirely?

Bambu P1S

0.4mm Nozzle

0.16mm Layer Height

Overture PLA Pro

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[–] RenegadeSC 2 points 1 month ago (1 children)

I haven't tested tolerance yet. I'll be printing a cauliflower when I get home. I downloaded the file, so idk what tolerance they had baked into it or if it was a true 1/2×28 thread modeled in.

[–] PhilMeGroin 3 points 1 month ago* (last edited 1 month ago) (1 children)

Print the above tolerance test, follow the calibration help page for that print, after that test+adjust for shrinkage, which should be consistent throughout the print, and will be adjusted by a flat % across the entire stl

[–] RenegadeSC 2 points 1 month ago

From the califlower test, I had a -0.1% skew. Fixed that and adjusted for shrinkage. Just printed another flashider, and it's much better now. Tight initially, but once worked back and forth, it threads on well. I imagine a tight fit is better than a loose fit.