Sculpfun S9 corner brace

I wanted a way to hold my sculpfun securely to the base I had it on, so I designed these corners.

Features:
- Fits on a 2'x2' plywood board
- M5 holes to bolt the printer down (or use zip-ties, or included printable pin)
- \#8 sized countersunk holes to screw into wood base. ( I've used [these](https://www.homedepot.com/p/Everbilt-8-x-3-4-in-Phillips-Flat-Head-Zinc-Plated-Wood-Screw-12-Pack-807241/204275573) )

Files:
- sculpfun corner 1.1: Fits outside the frame. takes up more space but still fits within 2 foot square
- sculpfun inner corner 1.1: Fits inside the frame. smaller, but not as easy to screw in
- sculpfun inner corner control cutout 1.0: Same as above, but only has a hole on one side, and avoids interfering with the screws that attach the control board cover
- sculpfun corner pin: Because I was out of M5 bolts