An openSCAD library to make a mounting surround or duct for a DC fan of specified size and length. Use in you own openSCAD fan mount designs or specify a longer length to draw a section of ducting or a make-up piece.Dimensions of DC fan included are 25mm, 30mm, 40mm, 45mm, 60mm, 80mm, and 120mm. Of course you can define your own too.**V2 adds cutter optionTo use in your own openSCAD design save the file in your library directory or in the file root. Call the library using the use<”filename”>; command.And use the module as follows fan_mount(size=60,thick=20,cutter=false );size is the predefined fan nominal dimension, thick is the thickness of the holder or duct. If cutter is set true then a the screw holes and corners are not generated allowing you to use it in subtraction operations.