Heat Bed Magnetic Fabric Holder

This is heated bed standoff replacement part which incorporates brackets for supporting a tension-bar for 3d printing on fabric. This is designed to fit a standard 200x200 printable area heated bed with 10mm standoff clearance between the Y carriage and bed. The holes are spec'd for 5x3 neodymium magnets. We used Weld-on 16 fast set glue to hold them in place.

See [this video](https://www.youtube.com/watch?v=Gv1y6_0jOhw) for an example of what we do with this (note: bracket was not installed