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layer set to 0.2, but sometimes it goes 0.19 and 0.21

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Posted · layer set to 0.2, but sometimes it goes 0.19 and 0.21

I'm having some issues with my printer. Some time ago i've build marlin from:

https://github.com/ErikZalm/Marlin

I'm not sure if there's a problem with the firmware, or with my hardware but if i slice a model and print it i noticed that the layer heights shown on the LCD are not all the same. Some layers varies.

Like this 0.2 -> 0.4 -> 0.59 -> 0.79 -> 0.89 -> 1.1 -> 1.3 -> 1.5 -> 1.69 -> and so on. So does this happens only for me or this is a known issue? At gcode output from slicer, everything looks fine, z is incremented by 0.2mm.

Any ideas?

 

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Posted · layer set to 0.2, but sometimes it goes 0.19 and 0.21

Simple rounding error, 0.60 is actually stored as 0.5999999999999999999999999999 internally in the chip, which is displayed as 0.59

Nothing to really worry about.

 

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