Measure the distance between waves as accurately as possible (measure many waves and divide by number of waves). Then measure the screw thread pitch as accurately as possible (how far does the Z axis move up or down with one full turn). Are they the exact same distance? probably. Maybe your Z screw is warped/tilted or bowed.
What happens is the Z distance is moved farther than average for part of rotation and then less than average for the rest. This means some layers are slightly closer together and they get slightly too much plastic and it squirts out thicker so you get thicker walls. Then the Z axis moves faster than normal and you get thinner walls. It's very subtle on the Z screw but it shows up visible on layer thickness.
I will try first thing tomorrow to measure the layers and compare them to the thread pitch.
As I was reading your reply I remembered that I saw the left Z screw have a little wobble while I was printing.
Sure hope it's not a mechanical problem.
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gr5 2,224
Measure the distance between waves as accurately as possible (measure many waves and divide by number of waves). Then measure the screw thread pitch as accurately as possible (how far does the Z axis move up or down with one full turn). Are they the exact same distance? probably. Maybe your Z screw is warped/tilted or bowed.
What happens is the Z distance is moved farther than average for part of rotation and then less than average for the rest. This means some layers are slightly closer together and they get slightly too much plastic and it squirts out thicker so you get thicker walls. Then the Z axis moves faster than normal and you get thinner walls. It's very subtle on the Z screw but it shows up visible on layer thickness.
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