Slightly Improved Orange Pi Prime case

The Prime is discontinued but they still turn up on ebay from time to time at low prices and provide a fairly good value if you throw a big heatsink on the H5, particularly now that Panfrost supports the GPU.

I removed the radiusing along the top and bottom sides because when printed via FDM they only look good from a distance unless you print flat-side-up with a ton of supports. Eff that.

The base is also 1mm thinner to save you like an hour of printing time because there is no reason for a 2mm thick bottom on this thing.

The screw holes now go all the way through the bottom of the case to give you a little more flexibility on the length of screws used.