Fan Shroud for E3D v6 Hotend on Printrbot Simple Metal with Secure Fit Spacer

Here's a fan shroud for the E3D v6 hotend on a Printrbot Simple Metal printer. It's meant to be used in combination with this E3Dv6 spacer: http://www.thingiverse.com/thing:958450

Because the hot end / spacer combination is shorter than the standard Printrbot hot ends, all other fan shrouds are too long. This fan shroud gets the air right where it needs to be when used in conjunction with the secure fit spacer.

The holes are self-threading. No nuts required. The screws need to be at le