Remixed Adapter for Sawyer Water Filter - No Leak (Rev 2)

(Rev 2) 

Total newb here.

I made three prints of the original Adapter (in PETG), trying different print settings for the original. They all leaked  - at the rounded midpoint, which cannot make a good seal with either the Smart bottle or the Sawyer squeeze, since both of those have 90 degree faces. (They might have worked - for a while - if printed in PLA. But PLA creeps under load. And since this is a threaded application, with loads on the (thin) threads, it seemed to me that it requires PETG.)

I don't know if the original author intended for us to use a washer in the middle. If so, I didn't see anything about it in his description. Regardless, a washer did not stop the leaking for me.

I noticed that Sawyer sells an adapter, and it's slightly different from the original print model here.

So I took the original Adapter stl, imported it into Blender, Boolean'd out the middle, and joined the two remaining parts. I scaled it down in X & Y to about 97%. I exported the result to stl. Then I sent it through the online Repair tool for clean up.

I printed the result. Mine doesn't leak. (See photo.)

In fact, mine is so airtight that I have to unscrew the adapter between squeezes of the water bottle to let air in the bottle!

(It's difficult to make perfectly precise 3d printed parts that won't leak under pressure, especially because printed overhangs are difficult to print watertight. The advantage of this design is that the water tightness does not result from the printed threads, per se. But rather, from the fact that the water bottle top butts up tightly against the top of the Sawyer.)

Printed in PETG, 0.4 mm nozzle, 0.16 mm layer height, 0.44 layer width, 3 walls. (Orca.) Extruder flow increased to 1.05%. Printer corrected for skew.

Happy backpacking!

I removed the inside (unthreaded) third from the original model, and I scaled the model down a bit in X & Y.