I have a Mini Kossel and I am going through calibration.
I can home carriages and find the bed with paper-test getting some Z value with
M114. Then I run the effector almost full height up and then down - and now Z value for the bed is greater!
If I repeat the process I get greater and greater values in paper-test. It seems that travel per step is different moving in different directions.
How can I fix that? I am using RAMPS 1.4 with Marlin firmware.
Z values near bed after subsequent runs of five passes of
G1 X100 G1 X10
100% speed: 0.1 0.3 0.5 0.7 1.0 20% speed: 0.1 0.4 0.9 1.4 4.6 6.6 300% speed: 0.0 0.7 1.0 1.3