Kinematic parameter calibration
Step 1 of 6Select measurement method
Determine the LC and LB kinematic parameters for your Rep5x printer. These values are needed for accurate inverse kinematics calculations.
LC = Distance from C-axis rotation centre to nozzle tip. Measured by aligning nozzle to reference at C0°, C90°, C180°, C270°. For Rep5x design, typically close to 0.
LB = Distance from B-axis rotation centre to nozzle tip. Measured by aligning nozzle to reference at B0°, B-90°, B+90°. Typical range: 40-60mm.
Camera method
RecommendedUse a USB camera mounted on the print bed facing upward. Align the nozzle with a crosshair overlay for precise measurements.
Requirements:
- USB camera
- 3D printed camera mount
Cone method
AlternativeUse a 3D printed calibration cone placed on the bed. Touch the nozzle tip to the cone tip at various angles.
Requirements:
- Calibration cone print
Connect to printer
Establish connection to your Rep5x printer via USB serial.
Serial connection
Click Connect and select your printer's serial port (usually contains "USB" or "CH340").
Measurements to perform
Select which parameters to measure. You can skip one if you only need to verify a single value.
Prepare printer
Home the printer and set the reference point for measurements.
Automatic preparation
The reference point should be where the camera is focused (typically the bed surface or a fixed point). This point remains constant while rotating the C and B axes to measure LC and LB.
LC measurement (C-axis)
Align the nozzle to the reference point at C0°, C90°, C180°, C270°. The distance moved reveals LC.
IK-assisted positioning
Auto-position using IK when rotating
Z safety lift
Z raised before rotating C-axis
Instructions
Position the nozzle tip at your reference point (camera crosshair or cone tip) with C-axis at 0°.
Measurement progress
Movement controls
XY Movement
Z Movement
C/B Rotation
Step size
Current position
LB measurement (B-axis)
Align the nozzle to the reference point at B0°, B-90°, B+90°. The distance moved reveals LB.
IK-assisted positioning
Auto-position using IK when rotating
Z safety lift
Z raised before rotating B-axis
Instructions
Position the nozzle tip at your reference point with B-axis at 0°.
Measurement progress
Movement controls
XY Movement
Z Movement
C/B Rotation
Step size
Current position
Measurement complete
Your kinematic parameters have been determined.
LC (C-axis offset)
millimetres
LB (B-axis offset)
millimetres
Save results
Values saved to printer
Click "Send to printer" to store LC/LB values in your printer's EEPROM. The firmware will automatically apply inverse kinematics during printing.