PP3DP Up Plus redesigned wind barrier

This is a redesign of the stock PP3DP "wind barrier" for the up 3D printer.

Features (compared with stock):
- fully closed design without the option to guide air down on the part (prevent leaking air)
- air guide included which conducts the air over the cooling fins of the extruder cooler (enhanced cooling capabilities)
- increased cross section of the exhaust
- replaces stock without any further modifications necessary

Limitations:
- If you intend to print PLA parts this design