Calibration tool with Z axis test
thingiverse
This calibration tool boasts a sturdy 20mm square base, with precise steps of 10mm intervals reaching up to a height of 40mm. With this tool in hand, you can thoroughly test the accuracy of all three axes. Unlike a basic 20mm cube, it allows you to pinpoint the source of any Z-axis issues. You can see from my measurements that I have a consistent .3 reduction in height, regardless of where measured, indicating a potential Z offset/start problem. If the issue lies with the Z step value, the error will tend to increase as you take higher readings. In my photographs, I'm utilizing an inexpensive vernier from Amazon, costing approximately $10 and boasting a resolution down to 0.1 mm. For most applications, this level of precision is more than adequate.
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