STEP Calibration Piece X Y and Z axis Free 3D print model

cgtrader

To achieve accurate prints, calibrate your printer accordingly. I discovered that my Ultimaker produced distorted models leading to difficulties with screw hole fit, etc. To resolve this issue, create a calibration piece to adjust X, Y, and Z-STEP values accurately. Simply print the piece and then carefully measure its three sides using a caliper, excluding the initial layers since they tend to be wider. The calibration object measures 100mm on both X and Y axes and 50mm on the Z-axis. You can then calibrate your STEPS using the following formula: X,Y-Axis: 100 / [measured length in mm] * [current STEPS]; Z-Axis: 50 / [measured height in mm] * [current STEPS]. For instance, if my X Axis X-STEPS were 78.4 and I measured the side to be 99.27, applying the formula yielded a new value of 78.97. I repeated this process for all axes and set these values either within the printer or directly in the MARLIN firmware source code under "Configuration/h". For example: #define DEFAULT_AXIS_STEPS_PER_UNIT {78.97,79.26,535.44,760*1.1} // default steps per unit for Ultimaker. Following a second print with the updated settings produced an accurate measurement of 100.07 x 100.05 x 50.02mm. Be aware that PLA and ABS experience different shrinkage ratios when cooled. Thus, calibration accuracy may vary depending on the material used; specifically, ABS tends to exhibit a shrinkage ratio between 0.5% and 0.9%.