Kossel / Delta Dimensional Calibration with Instructions

thingiverse

Calibrate the dimensional accuracy of a delta / kossel printer by printing and measuring a known object, then updating DELTA_DIAGONAL_ROD in your firmware. Waldamore has created a remix of this with accompanying spreadsheet to calibrate Cartesian printers https://www.thingiverse.com/thing:2390274 Post-Printing Requirements Kossel / Delta printer Calipers (preferably digital) Ability to modify & upload printer firmware Usage Print the part actual size, no scaling at all. Measure the part between the notches on the top in mm. Open your firmware "Configuration.h" and find the line (XXXX will be the current / default value) #define DELTA_DIAGONAL_ROD XXXX Comment this line out (do not delete it!) // #define DELTA_DIAGONAL_ROD XXXX Perform the following calculation (where XXXX is the current value) Measurement / 100 * XXXX Add a new line to your configuration with the calculated value (numbers provided are from my printer, you will have your own) // Previous Value// #define DELTA_DIAGONAL_ROD 218.0 // Calibrated DATE HERE// measured_length / 100 * original DELTA_DIAGONAL_ROD#define DELTA_DIAGONAL_ROD 221.27 Validate and upload the firmware with the adjusted value to your printer. Repeat if required. Important Note : Do not do this mid way though a multi-part print or project where connecting parts need to be consistently scaled. Once done, to get a new part to fit a pre-calibration print you may need to temporarily restore the original firmware setting.