need Help, maybe a defect in the Board ? extruder has problems with z-Axis
Hello guys, i need help with my Afinibot A3 Printer.
it has the long narrow Zonestar mainboard, its an older one with no auto leveling but it works great !
from one day to another it got an issue with the Z-Axis ! problem: it seems that the hight of the layers are not raising up correctly !!!
that causes prints that has only ca. 75% of the intended hight of the model and extreme over extrusion because of the reduced layers !
i didnt change anything and also old correctly worked gcode files has this issue, so it must be printer related.
is this a known problem ? is there a setup in the printer to correct this or via the small potentiometers on the board ?
Thanks so much !
- you have somehow changed steps per mm for z so it is not high enough. Try a 100mm move and if it moves that more or less without motor starting to whine it should be ok.
- your motors can not always move when you tell them to move and you loose some steps. Possible reasons: friction had increased, z jerk was increased, acceleration has increased, motor current was reduced. With the poti you control current with these drivers and if resistance changes so does current. There is also a potential point to measure a voltage that you can multiply with a factor to get current. Check melzi documentation for position and factor. All other values can often be seen and changed in eeprom settings.
From your test with tiny moves below 1 full step probably I take that resolution is ok.
I checke the eeprom settings and raise the step per mm for z. Axis from value 1600 which was the default to 2540. And Do some z-axis Tests and print works as it should now.
Poti change does nothing.... I really have no idea what causes this z-axis issue.... Maybe a small logic damage in the Chip or some resistor burned and leads to higher step counts....
Very Strange. Maybe I check this issue again with my spare control Board when it arrive.