#Prints have missing layers

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safe cairn
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So for a while I've been getting missing layers and initially thought it was under extrusion. I have tried 4 different hotends and 4 different extruders. I have also tried numerous nozzles and tried recalibrating the rotation distance of the extruder. That did not work. Someone pointed out to check if my z layers were off. I printed a 20mm test cube and the z height came out 20.15-20.2 while the x and y were spot on. I checked my config rotation distance and it looked fine. Unsure of where to proceed.

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thorn hemlock
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If you checked different hotends and extruders, either all of them are really bad or we can eliminate this as a cause of the issue. I'd suggest looking into your Z rails and Gantry. Check if everything is properly tighten and if your z is moving freely. I'd guess this is something mechanical on your z movement. Have you done a resonance test? normally if something is loose, it appears on the test

covert fog
safe cairn
covert fog