First I Need to say that you need to use caution when trying to use this device because you can injure yourself as the nature of these devices are to stretch and keep tension
I designed this model to be compatible with the Phallosan cup design to keep yourself under traction. This design works perfectly with the Medium Cup and I believe it will work with the small cup aswell as long as you find a way to secure the tip (I added hooks to the front of the tip anticipating I might need to use rubber bands or something to secure it on the cup). The models are about as easy to use as just printing it and putting it together. The model endrod_v2 will have to be cut with a razor blade or some other tool so it can spin freeley as I designed. This is the first working rendition of this device so it is not perfect but it work. I know that there are lots of upgrades to various parts I built and that this can be adjusted to fit the large cup. One last thing I want to meantion is that the base was made to fit my dimensions and if you alter it too much you will have to adjust the tip aswell which will be a bit of work. So if you do make upgrades or adjustments please remix this and let people know how it has been improved or have the option to try different dimensions. Thanks for checking it out and please feel free to comment your experience!