Improved standoffs for Raspberry Pi rack

Used with this Raspberry Pi rack: https://www.thingiverse.com/thing:2795195

I loved the idea of the feet and standoff accessories from Sarge3550. However, after printing the standoffs, I found that I couldn't really tighten the rack together because they had that sloped bit that M3 nuts couldn't really grab a hold of. Made a quick change in Blender so an M3 x 20mm bolt fit it perfectly.

If you're going to use this, you still need to download Sarge3550's thing to print the legs. This is only a remix of the standoff.