Magnetic encoder mount for hoverboard wheel motor (FFBeast, OpenFFBoard) - works with non-concentric axis hole, noob friendly assembly, even your grandmother can do it

This mount is designed for an 18 x 15 mm magnetic encoder (MT6835 or MT6701) and a 6x2 mm magnet. The hoverboard axle must have a 8 mm diameter through hole drilled into it, and the motor case must have a 24 mm diameter hole drilled into it. The most important thing is that it works with an off-centre hole drilled in the axle.

Loose fit version added for guys with a bit worse quality of printed parts.

M3 bolts are used to align and fix in place centering piece when drilling holes for M5 screws. You dont have to use those screws and proceed directly to drill holes for M5 screws however it will be a bit more difficult. If you want to you can remove M3 screws after completing the drilling process.

Two different versions of magnet holder as a lot of different designs of front plate exists. Please measure distance from wheel-centering-piece top face to glued magnet-holder top face which is marked as dimension 1 and between wheel-centering-piece top face and encoder top face which is marked as dimension 2. Standard version works with dimension 1 bigger than 2,5 mm and dimension 2 between 2mm and 4,5mm. Version with 1mm offset works with dimension 1 bigger than 1,5 mm and dimension 2 between 1mm and 3,5mm.

Idea behind this design is to firstly screw wheel-centering-piece using bearing as a axis guide.

Secondly to glue together encoder-holder to axis-fixture using previously centered wheel-centering-piece as a axis guide.

Assembly video here: 

Recommended material: ASA, ABS, PETG

5 perimeters for 0.4mm nozzle with 0.2mm layer height, bot and top 5 layers (1mm thickness), 25% grid infill recommended.

BOM:

3x M3x8 SHCS or longer - depends on rotor face design, should not protrude beyond inner face of rotor more than 1-2mm
6x M5x25 BHCS or longer - adjust length to your hub spacer, quick release etc.
6x M5 Nut or Nut with Insert Lock
3x M3x4 FHCS or longer - should not protrude beyond bottom face of wheel-centering-piece

A project  inspired by an idea from: https://www.printables.com/model/934160-ffbeast-encoder-assembly/