What would be most helpful for cosplay emergency repairs at a con?

I run a 3D Print shop and I'm starting to set-up booths at cons, where I want to run an emergency repair station (completely free) for those in need.

I have several 3d printers I'll be bringing along where I can quickly print out small fasteners/connectors/etc that I'll be designing/customizing on the fly, along with a mirror and a small crafting space with clamps, superglue, quick-dry / no smell paint, etc.

Any suggestions of cons that would appreciate this service, items that I could preemptively print that would be useful, or any other materials I could have on hand to make this a "pit stop" scenario where you're in and out and feeling confident on your cosplay again.
If you have any funny(now) stories of cosplay mishaps please share :)