Parametric Power Supply Bracket

Very simple bracket to mount a standard 50mm power supply under a delta printer. The rendered STL is fit for my BIQU Kossel Plus along with [Peaberry](https://www.thingiverse.com/peaberry)'s [Kossel Base Stands](https://www.thingiverse.com/thing:2024677) and my [Parametric Kossel Base Panels](https://www.thingiverse.com/thing:2577313). If you need a different size, this bracket is pretty flexible in Customizer.

The crossbeam between the two uprights isn't structural at all -- it's just to m