Colonoscopy Simulator
This was an attempt to make a colonoscopy simulator, which is a hollow colon through which one can pass a colonoscope. I printed mine in NijaFlex to give it a rubbery feeling. I used a needle and thread to sew the parts together.
To match a real colon, the parts should probably be scaled up by approximately 50%.
My original intention was to use this as part of my soft robot project (see here: https://www.thingiverse.com/thing:2705120). But due to some design problems there, I never actually ended up using this.
I am posting in case others might make use of this.