V3 Probiing Code Horizontal Radius Issue

[thechewiestbacca]

I recently cleared EEPROM, and went to re-run the calibration code fore the HE280, and all went well up until it went to calibrate the horizontal radius. The hotend would lower down to the X-Axis tower, and to its doubletap thing, then it would re-home, and repeat the process over again.

[Dale Eason]

I assume you are using the G29 code and if so
that is caused by each of the two probes calculating a Z height that are different from each other by more than 1 mm. It keeps trying until the two measurement are less than 1 mm difference or until maybe a max number of tries. I find that usually happens when there is still some filament or something on the nozzle. There could be other causes but unclean nozzle is what I have found most often.

Dale

[thechewiestbacca]

I am using the G29 code, and I made sure my nozzle was clean. What else could be causing 2 different heights to be registered?

On a side note, I took my HE280 apart the other day to replace a thermistor that I broke, and I put it back together with the cooling fan facing towards the Z-Axis, and the Hotend Whip facing the Y-Axis. I'm not sure if this makes a difference, but this is all I could think of.

[pouncingiguana]

The horizontal radius calculation is iterative and continues re-checking itself during probing until it's happy with the results with a maximum of 4 times. If you go to Advanced Settings -> Calibration Menu on the LCD while it's calibrating, you'll see it update the horizontal radius with smaller and smaller tweaks until it has it where it wants to be.

[thechewiestbacca]

So, let the code run, it will eventually move on to the next axes?

[Jimustanguitar]

The horizontal radius only probes the center and a point beneath the rear tower. As others have mentioned, it will do this multiple times until it returns a value that's in spec, and that's it.

[Dale Eason]

It might help you to know what the G29 code does in more detail.

After a home it lowers the probe to about 20mm from the bed at the center. Then It sends the probe close to each tower and probes the bed at each tower position with two downward probes for x,y, then z. That is to determine the tilt of the bed. It will store that information as end stop offsets for each tower. Next it will probe the center of the bed twice and then the Z tower twice to determine horizontal radius. It may do the horizontal radius more than once to try to improve on it.

If any of the two probes at a probe point differ by more than 1 mm it will retry there after a home I think.

Dale

[thechewiestbacca]

OK, that helped. So, I suppose that my poblem is not the Horizontal Radius, but the End-Stop Offset. Is the reason for the constant repeat of the probing still the same?

[Dale Eason]

OK, that helped. So, I suppose that my poblem is not the Horizontal Radius, but the End-Stop Offset. Is the reason for the constant repeat of the probing still the same?

As far as I can tell I think it retries whenever the values differ by more than 1mm.

It can help to use the console in MatterControl and look at the responses. It will tell you why it is retrying for some of this.

Perhaps loose belts could cause that condition or loose somethings somewhere. So that it does not get the same value for each probe.

Dale