Calibration Test Steps / mm Using 608 Bearing

thingiverse

Calibrate your X Y using a Standard 608 skateboard bearing. This method is better than the coin method as both inner and outer perimeters can be measured compared. The 608 bearing has an inner ring diameter of 8mm and outer diameter of 22mm. The shaft and ring have diameters of 7.9 and 22.1 mm and a height of 6mm. If everything is dialed incorrectly on your printer, then the bearing will fit snugly. Optionally if you have a [micrometer](https://www.youtube.com/watch?v=j0ARvWwMZX8) you can measure the height and adjust your z steps/mm as well. However, many of us have linear rods directly connected to stepper motors. The value for those are 400 steps/mm in the firmware. So using a micrometer is purely optional here. If the shaft is loose and the bearing doesn't fit in the ring, then your printer is printing items too small. You need to increase the steps/mm. Don't think too hard about it just increase the number :) It will take a few tries. If the shaft is tight and the bearing is loose in the ring, then your printer is printing items too large. You need to decrease the steps/mm in your printer. If both are tight, then your printer is laying down filament too wide. Try decreasing the extrusion width for perimeters. [Teaching Tech has a YouTube video](https://www.youtube.com/watch?v=c5jjwBqARpo) about linear advance where he shows how to adjust the extrusion width and other parameters shown here instead using an expensive caliper. Some printers allow you to adjust steps/mm using the on-screen menus. Other printers you can issue G code commands by opening a serial terminal or programs like pronterface to do this. When changing settings adjust both the x and y together. If you are changing these settings, please note that those setting will not be saved unless you save the values in the EEPROM with the M500 command or equivalent menu option because regardless of what is set in moment, it gets replaced with the values in the EEPROM on the next restart. ### Useful commands * M503 - displays current settings * M92 - sets the values example M92 X80 Y80 * M500 - Saves to EEPROM To check if your settings saved to EEPROM shutdown your printer and start it up again connect via serial and issue the M503 command to see current settings. Thats all for now. Thanks for looking. For more information on other cool projects that I am working on. visit https://wiki.noami.us