EasyThreed Nano Spool Holder - Modification

This is a modification of the EasyThreed Nano spool holder - which has been strengthened around the part that clips to the 3D printer. The changes include:

+ Thickened clip (more strength)
+ Rounded interior clip (more strength)
+ Slightly increased clip gap (to avoid strain)
+ Shortened underhang (less leverage / more strength)
+ Slightly elongated arm (to offset the rounding of the clip)

In the files you'll also find gcode for printing on the EasyThreed Nano (as it only just fits), a