IdeaFormer IR3v2 upgrade: Controller case

This thing is designed to IdeaFormer IR3v2 belt printer. The controller originally has a full metal case that decreases the strenght of the internal wifi antenna signal. This new piece of case replaces the half of the original metal box, contains an internal antenna holder, and air cooling holes. It has two ports to attach handle rod to the top-back or bottom-back position. Third part is a clip to fix handle to one of the chassis alu profiles of the printer. Use a washer under the holding screw.

Upgrade v2: Some minor changes. Saved some plastic on bottom side. Clip tights better because of new lock strategy. Antenna holder keeps a little better the antenna. Case corner rounded a bit more.