I have printed several 100 items with only minor problems.
Now have a fault, that on start of print, instead of moving down to the print bed ready to lay the 1st layer the Zaxis rises several mm.
If left the head proceeds to move to print but some distance above the print bed.
Movement upwards also occurs if I home the Z axis or all axes.
I have tested on Win 7 and Repetier 0.84 and Win 10 with 0.95. The same effect on both
Sounds like an issue with the Z endstop wiring or microswitch.
On clicking the Z home button the Z bar rises about 3mm wherever it is - at the bottom or near the top. It also rises when âRun Jobâ selected.
This happens even when the Z microswitch is closed (manually)
The endstop switch is ânormally closedâ, so it closes the circuit when idle and opens when active.
If you have a faulty wiring, this will make the printer tink the endstop is hit continuosly.
Best way to find that out is to check for continuity at the unplugged end of the endstop wiring.
If it has an open circuit, the wiring is faulty.
Sorry should hsve said âoperatedâ rather than âclosedâ - I manually pressed the switch lever. Have also unplugged the Z Axis stop switch from the board - still the same symptom.
Will check continuity this pm.
When the Endstop circuit is OPEN the endstop is ACTIVE.
So if you unplug the switch that will always trigger the Endstop.
This is why a faulty connection can cause erroneus upward movement of the Z axis.
ichbinsnur,
Tested the Z switch for continuity and it was closed. After replacing the Z stop plug on the board the printer works OK. Have made 5 prints without problem.
There is clearly a dodgy connection in the Zstop circuit. Currently using up my 3mm filament before upgrading to K8203 and 8204. If it lasts OK will check as part of the upgrading.
Thank you very much for your timely help - it is much appreciated. I now know where to look should the fault recur.
Nice to hear it works again!
Happy printing!