Wanhao / PowerSpec / Cocoon Create I3 mini y-axis bed extension

Warning:
Mod at your own risk. This mod will require a firmware flash on the printer due to the "software endstops" that are enabled on the printer. It is a good idea to have a copy of the original firmware to fallback on.

This is a y-axis bed extension for the Wanhao / PowerSpec / Cocoon Create i3 mini printers that enable the use of the entire build surface. The updated y-axis length using the original bed should give at least 225mm in total from the default 135mm.

The design of this wa