5-Blade Toroidal Propeller for GE WB02X11025 Range Hood

A 5-blade toroidal fan propeller remixed to replace the original 5-blade fan propeller for the GE WB02X11025 Range Hood.

The original fan for the GE WB02X11025 Range Hood is awful. It's made of a cheap plastic that, at this point, is so old that it had a high chance to RUD (Rapid Unplanned Disassembly) when used. I decided that I didn't want to clean up tiny bits of fan prop out of everything in my kitchen again, but did not see any viable alternatives on the internet. Thankfully, when I saw Drenth Engineering's toroidal fan propeller I was inspired and knew I wasn't going to have to start from scratch. 

The only part of the original GE fan that survived was the D-slot connector left on the motor shaft. This allowed me to test different diameter dummy pins to test dimensionality and tolerencing of my printed parts. Once I was confident in the sizing of the dummy shaft (6mm), I used the STL of the dummy shaft as a negative modifier on a filled-in version of the fan. I then excluded the rest of the model so that I could dummy fit just the connector onto the kitchen fan shaft. I'm glad I did this, because I needed to modify the negative part to allow proper clearance for the C-clamp to sit snuggly against the bottom of the fan minimizing potential vibrations. In order to install this new fan, I had to unscrew one screw of the guard rails along the bottom of the hood so I could swing it out of position. I recommend unscrewing the screw on the other side of the rail slightly so that the rail swings a little more freely. Don't forget to screw everything back in properly once the fan has been seated! These rails will prevent the fan from flying off the shaft and into the kitchen if it is not seated/fastened properly during test/final assembly! (Initially, during testing, I seated the fan onto the shaft and tested it without fastening with the C-clamp to make sure everything would work, but when I turned the speed down the fan prop liberated itself from the shaft prematurely and got caught up in the guard rails.)

I initially printed a ~156mm version, but found I had too much clearance around the sides of the propeller for my liking, so scaled it up a little bit more to ~160mm. One could scale it up even more to minimize the gap around the propeller and maximize the air flow. I did not do this. The toroidal propeller is already such a big improvement over the GE stock fan in both sound and air flow that I did not feel it needed to be min/max'd to that degree.

Orca wouldn't let me exporting the whole thing as one new STL, so I included the dummy shaft STL and the no-shaft-hole propeller STL in case someone cannot use the .3mf file for whatever reason. This should allow for the recreation of the final part regardless of printer/slicer, though, it will take much more fiddling than using the provided .3mf

Tested only with PLA (Panchroma Silk Silver. Snapspeed White), will update when I get the printer enclosed and can print it in the more dimensionally stable materials I have (ABS/ASA).

2 walls
.16 (adaptive) layer height. (to get the curve on the top of the fan properly sloped with no post-processing)
%80 gyro infill.

Note: There is an artifact on the bottom of the filled in fan of the old mounting hole. It is nanometers deep, so should not be printable on current FDM machines.  I did this in order to have a visual indicator as well as mathematical indicator for myself making it easier to line up the negative part in the center of the fan model.