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Thanks for sharing your make! I'm glad you like it!
Yes, the distance between the bottles was meant to be freely adjustable, the design only ensures a proper distance to the wall*. I tried to cover that in the summary.
*(The main idea was more to simplify the mounting process, by allowing to hold it to the wall with one hand and handling the screwdriver with the other).
BTW: it should be possible to print this without supports since the overhang is max. 45 degrees