Firstly, you’ve just persuaded me to buy a CR-10 V3 which is coming on Friday, thanks to £120 off offer on Amazon, so can’t wait to start printing the throttle! My Prusa’s are too small!
Secondly, in terms of the FMC, your design is clearly the best one I’ve seen and I’m curious to know if any of the pcbs out there you can buy will likely fit your design. I know it’s difficult to say, but wasn’t sure if anyone has done it yet. I’m currently learning how to make pcbs and happy to order a load when i have a functioning design, but just wanted to see if you knew of any that fit your design.