1/2 inch to 1/4 inch NPT Adapter

thingiverse

I could't find my 1/4" NPT tap and I didn't want to spend a ton on brass fittings so I threw together this quick 1/2" NPT to 1/4" NPT adapter. I did it in OpenScad using the great "poor mans screw library". Took about 10 minutes to throw together and 30 minutes to print on my MakerBot (w/ Acceleration). By request - I uploaded the .scad after adding a few comments to it. You will also need to download the screw library that this is a derivative of. Note that the threads in this library are not tapered so technically it's not NPT. At some point I might modify it again to add tapered threads but for now it works fine with teflon tape. Instructions I printed this "strong" with 3 shells and 30% infill @ .3 mm layer height. Goal is for it to be water-tight in it's application. The threads fit nice and tight...as is desired. It seeped a tiny bit in application - so I took it off and gave it a very quick dip/wipe in acetone. This sealed it up. Don't over tighten!