A note about fan cleaning if anyone reading this doesn’t know:
Be careful about using a compressor on your fans. If the fan spins too quickly it can cause damage, so hold the blade still as you blow them out.
Electric motors and generators are essentially the same, so as it spins your motor will create electric current. In theory you could damage the circuitry in the fan, the bearings — or worse, the controller board on the Glowforge.