So here is my 3D printed PA device. Weighs less than 16 grams, PA hook and lock is also TPU, but have a PETG version to determine which is better, key is printed in PETG and lock is similar to a security screw with almost infinite potential patterns. Will demonstrate putting it on in next upload, but basically pull the shaft through with the pantyhose technique, place PA hook from urethra through the piercing, then through the hole in the bottom of the chastity device. Lock screws on to the PA hook, to adjust height of PA hook to match the urethra's depth inside the glans , then lock is pushed into the locking space in the chastity device where the key is used to turn it the lock 90 degrees. Locking wings creates a friction lock holding the PA hook in place. PA hook is 3mm in diameter on screw side and 5.5mm on urethral side, so you can't maneuver off the hook. Kind of like a fishing hook, but much more benign. Entire hook sits inside urethra so urine exits in a straight line without making a mess. No urine leaks out the piercing for me, probably because my piercing is only 3mm. Pictures always speak volumes compared to a written descriptions. Look for my next post. Appreciate feedback, but try to be constructive.
I like your lock design. Looks good and sets more flush then my bijou. Might have to copy your design on my own project. I definitely wouldn't ever consider putting a 3d printed pin inside my piercing tho.
Yeah that seems to be the general thinking, but really has been ideal for me. Otherwise the design was much harder to incorporate a regular piercing that would not stick out of the urethra. Although I typically sit when urinating...there are some places that decision seems dubious at best. This design keeps the urine stream intact. Also liked the idea of no metal at all. Don't have to take off for metal scanners although small amounts of metal aren't likely to be picked up as they are all typically non ferrous. Doesn't the Beijou come with a 3D printed PA hook?
I wouldn't call it porous, but nylon generally has a high tendency to absorb water. I see that as a disadvantage with Evotion devices. I deal with it by applying a very thin layer of Vaseline to the most vulnerable parts of the device after the occasional cleaning / before putting it on.