Ahh 3d printing. Stereotypically for home use, it's the domain of little trinkets or function-less props, but turns out it's good for overcoming 2 sudden mixing bits of obsolete plastic.
My kitten is missing 26 j-wire guides, and instead of pushing 6$ a pop, I whipped up a 3d model and had a buddy print a sample.
Seems to me like these are going to work well, have a full set now on the way. Progress!