Monitor stand USB holder

I have one of those monitor arms that clamps to the desk. The main portion is a vertical pole and has this decorative plastic cone at the bottom. I thought "Why not use it to store all these USB devices?" A few hours in OpenSCAD later...

This uses the [BOSL library](https://github.com/revarbat/BOSL) for OpenSCAD. You will need it if you wish to use/modify the OpenSCAD file. If you just want the STL then you don't need it.

**I have not had an opportunity to print this yet.** I'm trying to sort out issues with my printer, but a friend asked me to share the model, so here it is. One concern I have is the size of the USB slots. I undersized them by 0.05mm in the hopes that they would grip just a little bit, but not too much. If you have problems you can adjust the **USB_width** value in the OpenSCAD customizer. The thumb drive I measured had a USB plug that was 12mm wide.