Stepper Motor Versions (N4 & N4 Pro) - OpenNeptune3D/OpenNept4une GitHub Wiki
Install Preparation (N4 & N4 Pro Models Only):
During the initial setup, you'll be asked for two key details:
The current for the stepper motors and the PCB version.
Be aware that these two models come with various stepper motors and PCB versions.
Caution:
Incorrectly setting the motor current can cause irreversible damage, so verify your selections carefully.
Determining Stepper Motor Current:
Choose one of these methods to determine your motor's current:
1. Serial Number:
Refer to the barcode on your printer.
Models before July 2023 (Neptune 4) or June 2023 (Neptune 4 Pro) use 0.8A steppers; later models use 1.2A steppers.
2. Printer.cfg File:
Look in the "TMC UART configuration" section of the printer.cfg file that came with your printer.
The run_current for stepper_x and stepper_y will show "0.8" or "1.0 to 1.2".
3. Stepper Inscription:
Check the inscription on the X/Y stepper motors. "BJ42D15-26V77" indicates 0.8A, and "BJ42D22-53V04" indicates 1.2A.
Determining the PCB Version:
When you access the eMMC, note the PCB / Main-board's version number, which will be either V1.0 or V1.1.
See here for images of each variant.