This is a 3d printed brushless motor I did for a school project a while back, this motor is a 3 phase brushless dc motor that is capable of slow but high torque applications, in other words, make sure you use the correct ESC for this. Also, seeing how it has a non-ferrite core (although you can increase efficiency by using a ferrite enlaced pla), it needs a spinning start in order to make this motor work (depending on how well you built it).

My first version of this used:

• 1/4-20 3 inch bolts
• 1/4 id 5/8 od bearings
• 28 gauge magnet wire
• 1"x.5"x.125" nickel plated rare earth magnets

To wire up this motor, follow a standard 3 phase why configuration, but I believe a delta configuration would also work. Also, to place the magnets, make sure that you align it so that they are alternating poles (there is an even amount of slots so this is possible), and glue them in well with cyanoacrylates.

I've tested two iterations of this motor, the first I spun too fast and it turned into a makeshift rotary IED, and we are still finding shrapnel all over the garage today, then later I tested out this current revision of the motor, but since I didn't have a proper mounting plate I held it in my hand and used an air compressor to spin it up until it reached a speed where the ESC could kick in (as I said, build it properly), and I dropped it before I could see what it really could do.

If you want to build this right, I recommend using this wire:

https://www.amazon.com/Remington-Industries-22SNSP-Enameled-Diameter/dp/B01BD80T6M/ref=sr_1_6?crid=3N0QCNS8MFAQY&dchild=1&keywords=20+gauge+magnet+wire&qid=1587794470&sprefix=20+gauge+mag%2Caps%2C197&sr=8-6

These magnets:

https://www.kjmagnetics.com/proddetail.asp?prod=BX082-N52

This glue:

https://www.amazon.com/Bob-Smith-Insta-Cure-Super-Thin/dp/B001NI4JWI/ref=sr_1_3?crid=2SKDU5C37H0OK&dchild=1&keywords=cyanoacrylate+glue&qid=1587794640&sprefix=cyano%2Caps%2C229&sr=8-3

These bearings;

https://www.amazon.com/PGN-R4-2RS-Sealed-Bearing-Lubricated/dp/B07GT739PV/ref=sr_1_4?dchild=1&keywords=1%2F4+id+bearing&qid=1587794654&sr=8-4

This screw:

https://www.amazon.com/Stainless-Available-Socket-Button-Screws/dp/B079H5DP8X/ref=sr_1_15?crid=1Z2OBUYPDM7KP&dchild=1&keywords=1%2F4%2B20%2B3%2Binch%2Bbolt&qid=1587794703&sprefix=1%2F4%2B20%2B3%2Binch%2Caps%2C206&sr=8-15&th=1
and a 1/4-20 locking nut

This pla for the stator (any pla is fine for the other parts):

https://www.amazon.com/Proto-pasta-Composite-Iron-1-75mm-500g/dp/B00X8BQYPS/ref=sr_1_1?dchild=1&keywords=magnetic+pla&qid=1587794802&sr=8-1

and a lot of patience when winding (it took me five hours, granted I was also watching pirates of the Caribbean)

Also, I haven't tested it, but this might work as an ESC

https://www.amazon.com/Brushless-Waterproof-Electronic-Speed-Controller/dp/B081C3RD2T/ref=sr_1_9?dchild=1&keywords=brushless+car+esc&qid=1587794851&sr=8-9

or something similar