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Looks like there are two versions in the files: the original, and the openlock set. The original version can't be converted to openlock (without gluing the openlock base on the bottom, but then those would be 1/4" higher). The openlock set is printed in two pieces: the openlock base and the tile; which gets glued together.

Using the original set with the openlock set basically just means that you can't lock them together.