mick.g wrote:first time on this forum and I came looking for this very information. I just started using ABS for the first time and i was having the same issue with the Z height. I also had to adjust an extra ~.2mm when using ABS and then spent many hours playing around with the height adjust.
is the workaround in the first post still being used by people?
hi and welcome,
at least I'm still using it.
There still will be some offset between ABS and PLA (and, if other materials with vastly different print temperatures come, they will likely have a different offset yet), but with this workaround this offset is consistent from print to print and does not need adjusting for second (third) print in a row.
The (constant) offset is caused by thermal expansion of the print head, which stabilizes a few minutes after heating the extruder.
It also helps to tie the vertical vanes in the printead air exit grid with a zip-tie - the head can split at this place and this moves the PINDA probe a bit (relative to extruder). A zip-tie will reduce flex of the print-head halves.
Edit: attach zip-tie here: