Dualstrusion calibration checker

thingiverse

SCALING REQUIRED I made this dual-extrusion print so that I can fine-tune the toolhead offsets on my dual-extruder Makerbot Replicator.The triangular teeth on the top row and the bottom row are aligned to each other at the center, but due to slightly different pitch, the outermost sets are nominally offset by 0.080 mm in the STL.For basic calibration, scale this print horizontally by 5x to make the offset 0.40mm (typical nozzle width). I suggest scaling both X and Y (but not Z) so that the print will stick well on the print bed.Split the mesh so that one extruder is assigned to the upper row (and base) and the other extruder is assigned to the lower row.By comparing the gap between the teeth, you can easily see whether the center is aligned.If the centermost peaks are aligned, you are done. If one of the other sets is better aligned, each step away from center is 0.1 mm of offset (when this STL is scaled at 5X).For finer calibration, scale the X by a smaller amount.When you think you are centered, compare the gaps between the slopes at each outermost edges. If you can notice a difference, you might want to fine tune the centering by another half or quarter step (0.05 or 0.025 mm when the STL is scaled 5X).The teeth has a bit of gap in the Y direction so that you can use this to fine tune one axis at a time.