HI,
Just for sharing, here is a AS5600 holder I have designed to snap on any NEMA17 motor without screws.
(waiting for driver and magnets to test it !)
JP
Great idea!
I see you have high hopes that FOC algorithm will keep the motor cold 
Well I have thought about temperature issues… and thus decided to print it with PETG rather than PLA
Melting temp is 260°C. “safe” temperature seems to be around 75°C : should be enough ? who knows
If not I will try ABS …
JP