Recess plug for Greg's Wade Reloaded with automatic hotend alignment

**Print is 1mm too tall. I'll fix it later.**

**Update: Scad & stl files for both 3mm and 1.75mm filaments!**

I switched from a jhead to a stainless steel Prusa hotend, however the new hotend mounts to an aluminum plate that has a slight depression where the hotend doesn't quite screw in all the way.

I've taken the recess part from the Greg's Wade Reloaded extruder scad and added a little extruding ring to the recess plug to allow my plate to automatically center on the extruder.

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