case is designed with the cores stored flat, so they fit the lowest IKEA kitchen cabinet drawer.
one tip, the Ultimaker3 remembers the XY calibration data of your core's but only when you use them in the same order, so you save 1 time calibrating per set when you keep'm in the same order (left/right).
In case you want a version with more or less positions you can simply adjust the step file.
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