Parametric Pipe Plugs, Bushings, Couplings, Caps, and Reducers (SCAD + STL)
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Are you tired of metal pipe fittings that don't leak and/or explode? 3D printing technology has the solution for you!
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UPDATE 10/14/2026: I made some changes to the NPT library, so the relevant files were updated accordingly.
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I wrote an SCAD tool for generating pipe threads that suck less than what I had been using. I used it to make a bunch of pipe fittings because I could.
This post includes three archives of straight fittings:
Plugs & Reducing Bushings (SCAD + STL)
Straight & Reducing Couplings (SCAD + STL)
Solid & Ported Caps (SCAD + STL)
The threaded portions of each part support independent print compensation. Sizes from 1/8" NPT through 12" NPT are supported.
Compared to fittings based on the Dan Kirshner thread tool, these files render much faster and produce much cleaner and smaller files.
Included is a large assortment of fittings up to 4" NPT. If none of the 100+ models suits your needs, just render something custom.
I shouldn't have to tell you that using FDM printed parts for pressurized fluid applications is going to be somewhere between a disappointment and a disaster. Thin bushings that may be acceptable in metal may be exceptionally impractical in printed plastic. You have been warned.
The archive includes the SCAD tool used for the NPT threads, but if you want the rest of the documentation that came with it, then here it is: