This is a simple slip-on cooler for your Makerbot Replicator 2 Nema 17 Stepper (Y-Achsis)
Powererd by a 40mm fan it keeps your stepper cool while printing.

Fan details:
40x40mm
Bolt-distance 32mm
Thickness ~11mm

4 Bolts: M3x20 (maybe you have to cut it a little)
4 Nuts: M3

If your fan has the wireing on an other side, please contact me to make a version with this cut.