This is a simple fan mount for the print head on a Printrbot LC+.
This uses a 40mm CPU fan, I got mine from an old computer.
(2) 4-40 X 3/4" Phillips Head Screws with nuts and (2) flat washers.
(2) 6-32 X 1 1/2" Phillips Head Screws with nuts and (2) flat washers.
1/8" Drill Bit
5/32" Drill Bit
Print and clean up the mount.
Drill out fan holes 1/8"
Drill out mounting holes 5/32"
Mount the fan using the 4-40 hardware.
Mount the bracket to the print head as follows -
Modify the 6-32 nuts by grinding down one edge so that they will clear the hardware on the back of the print head.
Remove the two bolts in the head and install the mount using the new 6-32 hardware.
Route the wiring, plug it in and start printing.
The fan on mine comes very close to the printing so you should double check the fit before printing so it clears.