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Strange shapes ! (3 replies)

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Im having some headaches trying to get to the bottom of weird dimensional problems.

My machine is a hypercube evolution and was running ok a while back so i know belt paths etc are all ok, frame is solid.

Running marlin firmware, slicing with cura and slic3r

Dimmensions from picture

x bottom 101.15
x top 100.00
y left 100.47
y right 101.13

diagonals are even at 142.55

I have adjusted belt tension in every way with only very minor effect.

rotated 45 degrees which resulted in acceptable sizes 100+-0.1 but was skewed.

I checked a print i did a few months ago and its all square !

I just cant see where its coming from, Any ideas ?

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