The "deeper" version has an extra thread length on the female side. This was primarily to use with my Amana dehumidifier. The first thread on the unit was stripped and most hose connectors are too shallow to catch more than the first thread. Deeper one solved that - just had to make sure I used a rubber washer with it for a good seal.
Huge thanks to codemite for his Garden Hose Thread Profile which this is a remix of.
I did 100%, but you could probably use a lot less as long as you make the walls thick enough.
Printed in TPU but probably ABS would be best for this. I don't believe the kind of TPU that comes as 3D printer filament is good for water contact applications.