Calibration cube with hole and bolt
thingiverse
I made a small 20mm-by-20mm cube with a hole and a bolt to fit in. The cube is 20mm by 20mm, the cylinder on top is 12mm, and the hole is 5mm. The bolt is 4.9mm. This device allows me to fine-tune my profiles perfectly, and it works very well indeed. With this simple tool, I can check tolerances or adjust the correct x/y compensation (horizontal expansion) settings with ease. If you print the cube and bolt at the same time, you can also test retraction and cooling settings simultaneously.
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