Calibration Problems
I recently purchased this kit as our first 3D printer and everything went together without a hitch. Calibration worked perfectly and buddy printed great. We then tried printing the T-Rex scull and everything went very badly. That print got all skewed after the first few lines and a calibration check dug into the bed. Every subsequent calibration has had additional issues and further scratched up the bed. I've watched the video several times, read a number of notes on the forums, completely rebuilt the printer a few times, made several PINDA adjustments back and forth, and, the last time, rebuilt the printer to have every component within 0.04mm of the specs found in one of the forum threads. Absolutely nothing I've tried has worked:
1. Auto Home has been calibrated right inside the from circle, but then none of the points were found during XYZ calibration. I now have it just slightly off center and most points are able to be found.
2. Self Test works with no problems.
3. XYZ calibration finds the first and second points, then digs into the board on point three. Sometimes, it also digs in on point 2. Point 1 had some rubbing at one point, but PINDA calibration seems to have fixed that.
4. Auto Bed Leveling works perfectly for the first six points, then moves too low on point 7, and jams on the board at point 8.
I've measured that the print board is level relative to the rest of the printer, verified that the Y axis is correct relative to the X axis, and verified that the print board isn't warped. I really can't come up with any other ideas at this point. Are there any other suggestions? I've got a useless printer right now, a thoroughly damaged print bed, and have no clue what to do next... I can't really afford to give up and buy a second, but pre-made, version from PRUSA...
The time it worked, the printer was amazing, so I really want to get this up and running for the family. I really appreciate any ideas. I don't even know how to test if there's a board / PINDA problem or if this is something else. Thanks!
Re: Calibration Problems
Your pinder does seem a bit offset, ie your printer bed is skewed a bit. Correct that.
Nigel
Life is keeping interested and excited by knowledge and new things.
Re: Calibration Problems
Sounds to me as though the probe is too high. Or one of the X/Y axes is not moving correctly.
Firstly, check that the pulley on the Y motor is not touching the motor body; there should be 3 to 4mm between motor body and pulley.
Then check that the belt pulley grub screws (both X and Y) are tight.
If you found a problem then try the calibration again, if not I suggest you try lowering the probe quite a bit, so that it is level with or below the nozzle. Try calibrating. If calibration still fails, then there is another issue we have to try to find. If it passes, then you will need to find the probe "sweet spot" by raising it one sixth of a turn and calibrating until the calibration fails and then lower it one sixth of a turn.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Calibration Problems
I will give that a shot - thank you very much!