Just completed upgrade from MK1  

Re: Just completed upgrade from MK1

There are no sensors in the bed.

You most likely assembled the extruder with inductive probe too high. Bottom of the probe should be 1-1,5mm higher than bottom of the nozzle.

Re: Just completed upgrade from MK1

I have had the Probe all the way against the bed and same height at the nozzle for testing but it does the same thing.

Re: Just completed upgrade from MK1

Hi,

[Edited]: Ok, just seen the Facebook message now.

First thing to check then is to ensure the probe is going at the right place, having the probe sensing the center of each circles is perfect, even if the XYZ calibration can find if the probe is a bit unaligned.
But if the deviation is too much, or the frame not square enough, then even the XYZ calibration will not be able to correct it.

You can check an article I made some time ago before the auto calibration was implemented, that could help to find a good starting build: http://help.prusa3d.com/mk2-movement-calibration/172660-p-i-n-d-a-probe-misaligned

Re: Just completed upgrade from MK1

I have had the Probe all the way against the bed and same height at the nozzle for testing but it does the same thing.

The probe has a red LED at the top of it that is on normally, but turns off when it "triggers". Does that appear to be happening?

If so, then perhaps there is a loose or broken wire connection. Triple check all of those, including where the probe connects to the rambo.

Re: Just completed upgrade from MK1

The red light triggers. I can also put a piece of metal under the probe and it goes off.

I have moved the Z to different heights and moved it back and forth seeing if there is a bad cable maybe and the light stays on.

Re: Just completed upgrade from MK1

Okay, self test - perfect. everything okay.

Calibrate Z - Not so much. First spot just find, second spot shoves into the bed, third spot okay, fourth spot starts hitting the bed and I shut it off.

You mention calibrate Z. I am assuming you meant calibrate XYZ? You need to run through that complete calibration.

Here is the flow diagram from page 12 of the handbook: http://www.prusa3d.com/downloads/manual/prusa3d_manual_mk2_en.pdf

Re: Just completed upgrade from MK1

I know that when I had a similar problem and I contacted support they suggested I lower the PINDA probe. For the Callibrate XYZ, it wouldn't hurt to have the PINDA probe really low, then raise it up until the problem happens again, and then lower it one turn of the top nut at a time. This is how I've calibrated my probe and now I have no problems.

Re: Just completed upgrade from MK1

The red light triggers. I can also put a piece of metal under the probe and it goes off.
I have moved the Z to different heights and moved it back and forth seeing if there is a bad cable maybe and the light stays on.
If you move the extruder above probing points where probing fails, can you trigger the probe by hand (by piece of metal)? It is possible that the cable is damaged and loses contact in outmost positions of X-carriage.

Re: Just completed upgrade from MK1

Yes David, I can trigger it by hand.

Re: Just completed upgrade from MK1

JohnOCFII hit part of it on the head. I was going out of sequence. I hadn't completed the XYZ Calibration.

When I run that - the first point (front middle) is found pretty quick. Then it moves to the second point (right middle). The X and Y move back and forth and Z slowly drops towards the bed. The light doesn't flicker with that normal movement, but then the bed starts doing two small figure eights and I see the light flicker several times when it is doing that, but then it fails and simply says, XYZ Calibration Failed. Bed Point was not found.

Re: Just completed upgrade from MK1

... but then it fails and simply says, XYZ Calibration Failed. Bed Point was not found.

When I first built my MK2, I was lucky enough to pass XYZ calibration first time through. Last week I changed my bearings, and in the process ended up making some small (1-2mm moves) of the nuts. I failed the calibration, similar to your message. I had to get my calipers out, re-measure everything, and realized I had lost the 100mm between the Z frame and the rear corner pieces. Once I re-adjusted the Z-frame washers and nuts to the 100mm distance, it passed calibration again. I was very surprised I had made enough movements to fail the calibration, but I did.

You may need to loosen up the nuts and start to re-measure again.

Good Luck!

John

Re: Just completed upgrade from MK1

So, I have spent numerous hours doing this XYZ calibration. I have gone and manually moved the head to the approximate locations where the LED turns off. I have re-measured (even with different calipers) and have 100mm from the Y Corner and the frame.

The unit goes through the XYZ Calibration, I watch the light flicker at each spot before it moves over to the next spot.

At the 4th point, it flickers, bounces up and down a little, then pauses (with the light out - which would indicate it is right on top of the sensor) and then reports XYZ Calibration failed. Consult the manual.

At least it is now going all the way through all the spots, but why would it fail at the last spot like that and even with the light out, say it failed?

Re: Just completed upgrade from MK1

http://help.prusa3d.com/mk2-movement-calibration/calibrate-x-y-info-and-errors

Check if Y-frame is actually square - measure diagonals, should be the same length.

Re: Just completed upgrade from MK1

It almost sounds like your PINDA probe is mounted too high. I would check that route if your printer is square. But definately measure the printer to make sure it is square. The Y-corners should have a spacing of 151.8 on the inside edges. The Y-motor mount should be spaced 67mm from the inside edge of the Power Supply Y-corner.