Raspberry Pi 3 Bumper

* Simple, robust, tight dimensions.
* Stand-offs and recessed areas for soldered pins.
* Built-in bridging on SD slot, remove bridging with an x-acto knife.
* Made for STEM classrooms or bench work.
* Mounting holes for an M2.5 tap with a thin bottom skin for punch through.
* Snap fit for use without screws.