Shimano Shifter Cable Entry Hole Plug

It's really easy to change the shifter cable on Shimano trigger shifters. All you have to do is take out the little plastic plug and you have a straight shot to pull out the old cable and feed in a new one. Then you just have to screw the plug back in, as soon as you find it. It was here a minute ago. Did it fall on the floor?
It's not that it's so expensive to buy a genuine Shimano replacement, it's just inconvenient. A trip to the LBS just for that? Or mail order and wait a week (and pay shipping)? If you print one you'd have the replacement pretty quickly. And in whatever color you'd like (maybe even glow-in-the-dark, so that maybe the next time you drop it, it will be easier to find.) And, while we're at it, although the Shimano original can be installed and removed with a phillips or flat blade screwdriver, a 4mm hex drive might be nice option, so I included files for both versions.
The original Shimano part appears to be nylon. I printed one with ABS and it seems to thread in