Z axis calibration on upgraded MK2

when calibrating z axis the print head crashes into heat bed and tries to push past it.

self test fails because of this action.

Tried to print a file and still Z Axis crashes into heat bed.

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I have similar problem, only difference being I succesfully calibrated the printer, printed one object (without issues) but when printing second object x-y dimensions were distorted.

Consecutive selfcheck went fine but z axis calibration resulted in aforementioned crushing into heatbed.

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Make sure the PINDE is adjusted to the proper height.

It should be a couple of mm above the extruders lowest point.

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I emailed info@prusa3d and they prompted me to check the x-axis pulley. It was indeed loose. Tightening it solved the problem entirely.

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1. Is the light on the top of the P.I.N.D.A on ? If not, check the connection on the RAMBO board. If so, double check where it's plugged in.

2. Check the height on the P.I.N.D.A. sensor? Make sure it's the same as the directions.

3. When calibrating, is it directly over the first circle? I had an issue where the x end stop was a little off which caused the whole X access to be shifted a little

4. Make sure the pulley on the X stepper motor is not loose.

5. Update to the latest firmware. 3.0.6 and run the X/Y test.

Hope this helps.

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So I had the same problem and have a bunch of dents in my heat bed to prove it. Its pretty scary to see that print head trying to drive right through. I chatted with PRUSA and sent them a movie of it (Another dent in the bed.) and they thought it was the PINDA probe. I checked that and it was ok. I checked the x axis pulley and it was ok. So what now. Further internet search showed that it was probably due to the incorrect placement of the z axis frame. You can test it like this. There are 9 sensors in the heat bed that must fire when the PINDA probe come over it. Only two are marked but you can see the others if you look pretty hard. Take a pencil and mark them so you can see them. Ok so if your z axis frame is in the right place then the first sensor should come down in the center of the circle. If the Z axis frame is crooked then it might be ok on the first point but a little off on the second and a little more on the third. And in my situation it was the fourth one that was off enough not to fire the PINDA and the extruder head kept on going not knowing that it had hit the bed. Now what to do. I was having trouble measuring accurately with a flat ruler with no flat spaces to take the measurement from. I bought a digital caliper for $35 dollars and made all the difference. Step three of the assembly instructions says to place the z axis at 100 mm from the y axis corner. That will get you started... but the real location of that assembly should be where that first heat bed dot is dead center. Adjust the left side first. Make a real accurate measurement and then bring the right side to the same measurement. This should square the heat bed up and hopefully get the sensors close enough to let the pinda fire.

This was the best description of the problem and how to fix it.

http://help.prusa3d.com/mk2-movement-cal...

Hope this helps somebody.

Coyotemike

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I Had a similar issue, somewhat related to the referenced article, What i did is prior to launch the Z calibration I aligned the probe just above point 1. Launch the Z calibration subroutine and voila. the process started and finished as expected.

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I found I had to really tighten up the 2 PINDA probe screws otherwise it moves about and the printer calibration goes wild

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