Jan 1 2019 I just got an idea about printing a stand that snaps to the rods and sits on the print bed in which assuming the bed has been leveled you can then rest the stand on it helping align the rods from support underneath.
Jan 6 tested these out & they worked perfectly the first time.
Please let me know if they work for you too. If you are ever up to the challenge of messing with your gantry.
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