I got one of these Ryobi Air Pumps a few years ago, and it worked great for filling bike tires, and I occasionally used it to fill my car tires, though it’s really not great for that. At some point last year it started smoking a bit and I thought the motor was burning up, so I opened it to find the fan (that appears to be meant to cool the motor) slightly broken.
I found a customizable fan blade file and modeled it to fit the motor shaft. It printed well enough and I put it in place.
I did have to ream out the hole with a drill bit, but once I did it pressure fit on the shaft perfectly. I’m not really sure how the original fan broke, but at least now I’ve got a replacement, and can make more if needed. (I printed it in PLA, so it might melt… who knows?)
Oh, and does it work? Well, the pump runs, but it always runs. I did smell what seemed like burned motor winding, so I’ll need to try it out on the bike tires and see if it’s up to the task.