For a cheap and easy DIY setup it would help reduce cost for those that simply can’t afford better. Also running the gears wet (which you can’t do with the metal planetary gearboxes) allows them to be cooler and potentially increase lifespan. I also think the gears built onto the prop is interesting as it shortens the unit substantially.
6384 motor is cheap and accessible…
The metal gears don’t fail from the temperature but from a combination of too high torque transfer and too high speed
Yes, I’m a little late with my topic. It would have been useful a few years ago, when many were looking for an affordable gearbox.
I used a bike gearbox just to make the assembly cheaper.
Maybe this will be useful for those who don’t have enough money to buy one of the direct drive motors. And Robert (RKC), on the contrary, made the design more expensive. As far as I understand, he was looking for a way to more efficiently use the energy of the motor and, ultimately, the battery. I don’t know why he wrote this in my forum thread, he could have created his own. My thread became the site of discussion about his printed gearbox. But I have no complaints against him. 
Maybe someone will be interested in this information.
Very few would have used a bike gearbox. It’s terrible hydrodynamically and less efficient than a planetary gear design.
Roberts design would work well with the motor you have used so it would actually improve your concept and 3d printing gears is costless of you have a 3d printer.
Hallo, Jezza!
I saw that Pacificmeister was experimenting with belt drive. So, my gearbox can have unnecessary parts removed from the body, and then its dimensions will differ little from a belt drive. ou just need to think about the connection to the motor. Plus it only costs about $20. Here’s the gearbox I mentioned earlier that worked on my e-surfboard along with the belt drive. This is the same gearbox, but part of the housing has been removed, and look: it is much smaller.
I used a SSS 56104 motor for my efoil, like many here. and how can Robert’s development serve me? I doubt that at such speeds as the 500 kV motor produces, the plastic gears will last a long time. Its bearings cost much more than my gearbox 
. I don’t encourage everyone to use it, but it helped me a lot to build the first prototype.
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