Snap-Together Geeetech G2/G2s Layer Fan System

Fan ducting system for the Geeetech G2/G2s/Pro Delta Rostock printers.

The fan system is a snap-together system, for both direct attachment to a 40mm blower fan, or to a external blower using a 22mm ID hose (commonly available as CPAP machine air hoses).

Supports the following hotend spread configurations:

* Single hotend G2
* Dual hotend G2s (20mm spread)
* Single hotend G2 Pro
* Dual hotend G2s Pro (26mm spread)
* E3D v6 separation (30mm spread)