Simple various sizes fan adaptors
thingiverse
These adapters aid in fitting a small fan through a larger opening. They are more straightforward than those in http://www.thingiverse.com/thing:211 12 due to size errors in the 40to30 file. Created using CATIA v5, both CATpart and STP files are available for modifications. I presently have 40x40 to 30x30 and 80x80 to 40x40 adaptors; custom sizes can be made upon request. Attach the printed adapter to your large hole using acetone+ABS (for ABS prints) or alternative methods, creating a smaller opening.
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