TPU Small Collapsible Rinse Cup

I designed this to be used in a portable watercolor kit.

It took several attempts to get the collapsing geometry working reasonably well. I'm mimicking the form of a larger cup I got off amazon that is too big for my purposes. I'm pretty happy with the results, but it does take some finagling to collapse it flat. Probably due to the size and relative stiffness of the TPU vs the silicone used in the amazon cup. 

I did a quick search, but was unable to find anything similar here on printables. Let me know if you've come across anything I can check out, or I'd be thrilled if someone attempts a remix for better results :)