Knobs for M3 Brass Standoffs (for FlashForge Creator Glass Clips)

We've been using the [Corner Glass Clips +3mm](http://www.thingiverse.com/thing:1233008) with our FlashForge Creator Pro printers at [TheLab.ms Makerspace](https://thelab.ms) for quite a while now, and we're quite pleased with them.

We've been using the spare wing nuts that shipping with the printers, and one of those wing nuts eventually stripped an M3 screws. Those wing nuts are only a few threads deep, and that put a lot of stress on the threads on the bolt.

These knobs are designed to