Raise3D air duct, cold side only

Replacement air ducts for the Raise3D N series printers to print with plastics (such as ABS) that print best without cooling or for other mods that separately add object cooling fans.

Only tested for fit, let me know if you have any issues.

2-12-16 Source file added, Auto desk inventor LT.
2-18-16 V2 uploaded, increased screw hole size.