A while ago I modified a circular fan duct and mount created by mcleishn on thingiverse for my Hictop Prusa i3, it is actually my most popular design thus far. The modified version had an improved duct that was easier to print and a mount for an 12mm inductive sensor.
I used this sensor for quite a while, however there were a few issues with this design:
- Stability – The mount had some issues with part moving as the printer moves back and forth, which caused the sensor to be slightly off alignment in certain positions.
- Losing the nut – The fan duct was held by a nut and bolt which used pressure to hold the duct in place, however during disassembly the nut would fall under the printer and was rather annoying to find.
- Sensor size – I no longer have the sensor instead I have an 18mm sensor which was my main reason for this improved version.
I attempted to again to modify the original to improve on the above, However after much frustration I decided it was better to ditch the design and completely redesign the mount from scratch. The new design came out like this:
As can be seen, I have improved my original design by making the base completely solid and adding a lip to the left to prevent mount from bending during movement. I also made the sensor mount one solid part with a M3 nut sized hole which prevents lose. And finally, and most importantly I made two versions with different diameters for both 10mm and 18mm sensors.
The new version can be found on thingiverse here.