I have installed the Hemera on my Ender 5 Pro. Physical install and wiring went fine. Wiring: The stock creality E Stepper (see image below) and the Hemera stepper have pins 3 & 4 swapped so I updated this in my wiring loom and verified with a continuity tester. Hemera stepper datasheet (see page 6). https://e3d-online.dozuki.com/Document/UBaWiCkBAAlCkZBG/Hemera-Datasheet-(Edition-1).pdf Firmware: Flashed TH3D firmware U1.R2.A2 set the following switches in addition to the standard stuff: // If you have a direct drive machine with a filament sensor uncomment DIRECT_DRIVE_PRINTER to decrease the unload length from 100mm to 20mm #define DIRECT_DRIVE_PRINTER // If you want to change the Esteps for your printer you can uncomment the below line and set CUSTOM_ESTEPS_VALUE to what you want - USE WHOLE NUMBERS ONLY // This option sets the esteps from the CUSTOM_ESTEPS_VALUE line below. // If you need to reverse the e motor direction also enabled the REVERSE_E_MOTOR_DIRECTION option. // Example EStep Values: TH3D Aluminum Extruder - 95 ESteps, TH3D Tough Extruder - 463 ESteps, BMG Extruder - 415 ESteps // When installing a Tough Extruder or E3D Titan or Bondtech that is Geared you likely need to enable the REVERSE_E_MOTOR_DIRECTION option #define CUSTOM_ESTEPS_VALUE 400 #define CUSTOM_ESTEPS #define REVERSE_E_MOTOR_DIRECTION (I tried this both ways with no visible changes) // If you are using an E3D V6 Hotend (or Hemera) with their cartridge thermistor (not glass version) uncomment the below line. #define V6_HOTEND Vref: I couldn't figure out what Vref to use, found this post on youtube (Ryan Unruh) in the comments vref calculation for 2208s 1.3A stepper motor on the hemera 1.3/1.41 = .942 (root mean square) (.943 * 2.5) / 1.77 = 1.33 (max vref) 1.33 * .9 = 1.19 (final vref with safety margin) I used a ceramic screwdriver and a meter to adjust my vref on the v1.1.5 board to 1.19v as indicated. Issues: When I start up the printer, get the hot end up to temp, the hemera makes a grinding noise when it attempts to extrude. It doesn't seem to be powerful enough to pull in the filament as I try to load it. I am not sure it is turning in the right direction. Obviously something is wrong. Things to check would be greatly appreciated.