Fast, Low Material, Calibration test for holes, gaps, matching pegs, XY orthogonality and scale. It's meant to have fast iteration rounds while fine tuning both printer and slicer, to achieve good accuracy in printing functional parts that are meant to fit together. Other calibration tests were taking too long and using too much material. Those big calibration tests are useful as final verification of the tuning, but IMHO not quite efficent in rapid iterations.

About printing/using these models:

• Squares and circles have respectively sides and diameters going from 20mm to 2mm, in steps of 2mm.

• Gaps in the perimeters of both squares and circles are 2mm wide, minus the smallest square. That one has a 1mm gap.

• Thickness of the plates is 1mm. Each level of the pyramid/stepped cone is 1mm thick.

• The pyramid and the stepped cone are meant to fit exactly in the corresponding holes in the masks, both the holes with and the holes without gaps in their perimeter.

• Cura uses different strategies for holes with closed perimeter and holes with open perimeter, hence the versions with and wthout gaps in the perimeters of the holes. Both must fit the probing pyramid/cone pegs.

• Do not allter the drawings, for compensating for elephant foot. The elephant foot is an artefact caused by the slicer, fix it there. You want to tune the slicing tool, once and for all, instead of altering each and every drawing you will print.

• Print without skirt/brim/raft/anti-warp tabs.

• To verify that both X and Y dimensons have same precision, and that they are at 90 deg, test the inserton of the pyramid and the stepped cone at varous angles, in the same hole: 0, 90, 180, 270.

• AFTER CALIBRATING X & Y: If you want to use this model for testing also against Z banding and in general for vertical accuracy over a wider thickness, use the slicer to scale it vertically as much as you need. For example 10 or 30 times thicker. Every test must still pass.

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