Thanks! Nice! What spindle are you upgrading too? BT30? What controller?
Yes those are line reactors, I spoke with DMM throughout the entire build process and they recommended line reactors.
I have two breakout board types I'm using there. One type are 2x8 pin header breakout boards so I can use the the same cables that connected to the previous stepper drivers to the Mikini front panel. The other type are just DB25 breakout boards. I found them both on Amazon. I think I just found the cheapest ones. I also bought some DIN rail mounts so I could just mount them to DIN rails. I actually have the DMM breakout board but was unable to get the Mikini DIR signals to work correctly to change the motor direction. So ultimately I just built my own breakout using four DB25 breakout boards.
DB25 breakout boards: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
2x8 pin header breakout boards: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Extra DIN rail mounts (if needed): https://www.amazon.com/Sysly-Mountin...9S7KDRD1VX8KZN