I had an ancient Pi Zero I wanted to use again, but the old CSI port for the camera had long lost its clip. They're incredibly brittle. So, I just made a new one to plug in.

This is still experimental, but it's working so far. The little fingers are tricky since there's not much room in the holes that the clip needs to slip into. They may need some trimming on the anchor end to actually fit in there since every printer has a different tolerance. Since one side of mine was broken, I only needed to worry about the one side. 

Even if the fingers don't work, it's still fine as a plug for just keeping the ribbon cable in, and if it gets lost again, just make another :D

I used a 0.6mm nozzle for mine, but any will do. Be sure to use 0.2mm layers as the bit that goes into the port is exactly that thickness. I just used PLA but maybe PETG will allow a bit more flexibility.