What this tool calculates
Apply one measured motion test to a current firmware value without reversing the correction ratio.
Formula and method
Corrected steps/mm = current steps/mm × commanded distance ÷ measured distance. Corrected rotation_distance = current rotation_distance × measured distance ÷ commanded distance.
When to use it
Use this only after confirming the theoretical hardware value and measuring direct axis travel with backlash approached from the same direction.
Worked example
If an axis set to 80 steps/mm is commanded 100 mm but moves 99.5 mm, the corrected value is 80.402 steps/mm. A 40 mm rotation_distance becomes 39.8 mm.
Assumptions and limitations
The measurement error is proportional and repeatable across the tested distance. A single scale correction cannot fix backlash, skew, loose pulleys, missed steps, thermal shrinkage, or nonlinear measurement error.
Common mistake
Do not calibrate machine motion by measuring a printed cube; material shrinkage and extrusion width add unrelated error.