12) Re-run the
TOWERS.GCO
file and watch as you did before, again noting the changes in
the nozzle at each pause. You will run through these steps till the nozzle remains the same
height at each tower when compared to the center.
If the nozzle goes the same direction on all 3 towers (such as you have the gap in the center,
and at every tower the nozzle lowers. Or you have the gap at the center and at all 3 pauses the
nozzle raises), you will adjust the radius in the following way.
13a) If from the center gap, the nozzle goes DOWN toward the glass at ALL 3 TOWERS, load
your host software and bring up the EEPROM information. You will look for Horizontal Radius.
You want to RAISE that number. I suggest raising it by 0.2 and run towers.gcode to see the
change, and keep raising the number till the gap evens out (changing this number will not make
you need to re-set your z height, it will just raise the outer edges where the nozzle pauses).
13b) If from the center gap, the nozzle goes UP away from the glass at ALL 3 TOWERS, load
your host software and bring up the EEPROM information. You will look for Horizontal Radius.
You want to LOWER that number. I suggest raising it by 0.2 and run towers.gcode to see the
change, and keep raising the number till the gap evens out (changing this number will not make
you need to re-set your z height, it will just lower the outer edges where the nozzle pauses).
After doing this, you will see any changes where one tower may be higher than another, if this is
the case, go back to adjusting the end-stop screws as before.
Typically it can take anywhere from 5-10 or so re-runs of the tweaks to get the gap to remain the
same at all 3 pauses compared to the center of the machine. Once the gap is the same at each
tower compared to the center, your machine is calibrated and ready to print!
The guys at SeeMeCNC produced a really nice video that illustrates the entire calibration
process. You can view it using the link below.
https://www.youtube.com/watch?v=g3CqWxTcV38
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