calibration stick

thingiverse

Use this formula to calculate the ideal steps per mm for your printer (X- and Y- Axis). To do so: 1. Print a test object. 2. Measure its length without removing it from the printbed. 3. Calculate new steps per mm by multiplying 150mm with your current steps per mm, then dividing that result by the measured length. 4. Enter your new steps per mm value into your printer's software. If you're unsure about step 3, multiply 150mm by your current steps per mm and divide that product by the measured length. Remember to print a test object twice: once for each axis calibration.