Replicator 2x Upgrade: Indexable Print Bed Leveling Nobs

It's easy to lose track of a perfectly level print bed. A quarter turn to one leveling nob here ... an eighth of a turn there to compensate for problems from print to print ... and whamo! Suddenly you need to re-level your print bed. Wouldn't it be nice if you could get things level, and then set some sort of indicator to tell you what orientation the nobs need to be returned to in order to reset the platform back to its original height? Well, now you can!

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