Better 3 axis calibration cube

prusaprinters

<p>This is a precision 20mm XYZ calibration cube which improves on the typical calcube. There are two issues with the typical cal cube:<br/> 1) Hard to make an accurate Z axis measurement because either you have error from the squish of the first layer or the uneven surface from the raft/support<br/> 2) Over/under exposure/extrusion can result in a growth of all dimensions by a small amount which is an offset not a scale error. When you measure two outside edges, this error is additive and is erroneously included in the scale correction.</p> <p>This cube addresses both of these by making the measurements via the caliper/micrometer depth gauge. By taking a measurement using that instead of the jaws, the overexposure error cancels so that doesn't create error. Also, the Z axis reference surfaces are not touching the bed or any supports.</p> <p>There is also a 34mm circle cut into the bottom 10mm which can be used to check for XY squareness (using the jaws to compare two opposite corners to the other two).</p> <h3>Print instructions</h3><p>Category: 3D Printer Accessories</p>