Bent PINDA mount  

Re: Bent PINDA mount

Hi kevin,

I get the calibration wrong thing all the time. It is now my most hated message. But nonetheless it tells you that is something wrong.

I had also filament in the y pulley which totally screws my calibration but yours is just not possible with the bend pinda probe.

It needs to be 90 degree down to get accurate measurements.

I often thought to redesign the extruder to make the pinda probe a bit more sturdy for that kind of thing... But did not find the motivation for it...

Anyhow, make sure you use the pinda protector. Use the big one and print it from ABS or PETG or Greentec.

Hope you can fix your bend probe..

Keep us updated:-)

Re: Bent PINDA mount

> The Prusa documentation says that the calibration compromised message is just a warning - but i have a feeling my mesh is not going to be as accurate now? Has anyone else had a bent PINDA probe and does it still work reasonable well? Debating if i need to re-print some parts for the printer now...

What is the exact wording of the error message?

If the PINDA probe cannot physically reach the first row of the calibration points, then you should fix the mechanics of the printer by moving the frame slightly away from you along the Y axis screws.

Vojtech

Re: Bent PINDA mount

ok, looking at your pictures, you seem to have two issues:

1) The position of the Z frame along the Y threaded rods is not correct. You have to move the frame slightly away from you at the threaded rods.

2) From the pictures it seems that it is not the PINDA probe that is not perpendicular, but the whole X axis is skewed. You have to run the Z axis up to the end stoppers until both the Z motors skip. This is actually the 1st step of the XYZ calibration.

Vojtech

Re: Bent PINDA mount

Hi Vojtech!

Thank you for the response - I did drive the X-axis to the top to level it, thank to some clever firmware coding 😉

I'm fairly certain that the probe "arm" is bent, not the X-axis itself. I can apply gentle pressure and get the probe to move back to its nominal position.

I've done some testing, and it appears that my printer still levels pretty well! I had to reduce my z-height offset by about .4mm, but now it seems to be working well. I had to change the offset because the probe is slightly skewed, but still triggers at the points. The skew means that the z height between probe tip and nozzle has reduced, but i've compensated with the live-z height.

I will check my Z-frame alignment to the threaded rods, i'm sure it could be better! Perhaps i will print some tools to help get it into alignment...

Re: Bent PINDA mount

If you can coax a print out of it , the first thing i would print is a new extruder housing 🙂 so you can fix the bent pinda mount problem 🙂

If you cant manage to print one out, and your in the US, let me know, i can print one and mail it to you. (save you cost and shipping time from PRUSA)

Re: Bent PINDA mount

I agree with Erron. In extreme case the probe holder might be fixed by warming up (using hot air gun) and gently bending back to its original position. But it is very delicate operation and if there is possibility to get spare part, I would always prefer it. 😉

Re: Bent PINDA mount

> I've done some testing, and it appears that my printer still levels pretty well! I had to reduce my z-height offset by about .4mm, but now it seems to be working well. I had to change the offset because the probe is slightly skewed, but still triggers at the points. The skew means that the z height between probe tip and nozzle has reduced, but i've compensated with the live-z height.
>
> I will check my Z-frame alignment to the threaded rods, i'm sure it could be better! Perhaps i will print some tools to help get it into alignment...

As we engineers say, if it works, don't fix it 🙂

The induction probe has a directional characteristics, which is not that sharp, so it tolerates some tilt of the probe. I would recommend to print a replacement part now, but to replace the printed part only when something breaks or for example when you need to dismantle the extruder assembly if for example the nozzle gets clogged. I personally don't see a reason to fix it if it works now.

Regarding the first row of calibration points out of reach, you may be well at the threshold of what the firmware considers all right. As long as the probe targets the sensor points of the bed correctly during the normal 9 point bed leveling, the printer bed leveling should work all right, so again no need to fix anything. The skew correction may be compromised as the message says, so right angle prints may come a bit skewed. A bit means roughly 1 to 2 mm skew over a 200mm distance. The "calibration compromised" message says, that the printer cannot know, because for the proper calibration it has to reach slightly behind the centers of the bed calibration points and this was not the case for some of the points of the first row in your case. Again, the printer does not know, but your calibration may be ok. If you are fine with your prints, there is no need to fix anything. If you require the XY axes to be precisely perpendicular, you may try to adjust the Y axis in the Z frame, or you may try to print a thin large box and verify the right angles.

Vojtech

Re: Bent PINDA mount

As we engineers say, if it works, don't fix it 🙂

Not all of us say that 😉 Some of us would much rather improve things...

Peter

Re: Bent PINDA mount

vojtěch.b3 wrote: "As we engineers say, if it works, don't fix it 🙂 "

In the UK, we engineers say "If it aint broke, don't fix it" A sensible approach. Fiddling breaks things.

My Genuine Prusa MK2 is singing along nicely, i get great prints in silent mode. Noisy mode (High Current) makes no difference. Except, the noise annoys, if running a print overnight. So I wont touch it, as it is dialled in for me. Perfect prints everytime now. So why fiddle?

Re: Bent PINDA mount

In the UK, we engineers say "If it aint broke, don't fix it" A sensible approach. Fiddling breaks things.

And in the UK, all wheels are still made of stone... Oh, wait... The Romans came and gave us wooden wheels... 😆

Peter

Re: Bent PINDA mount

PJR wrote "And in the UK, all wheels are still made of stone... Oh, wait... The Romans came and gave us wooden wheels... 😆

Peter"

Peter was that really supposed to be funny? I guess we are not equal in humour across Europe . Good reason for Brexit, as we Brits were just joking 😉 or Not!

Did the stone wheels work at first yes. Did the wooden wheels work at first yes, did they break yes. Were they improved upon, yes. After they broke! Get it. Hence the UK saying "If it aint broke, don't fix it" Maybe I should add the caveat "yet" Fiddling often breaks things, just by fiddling.

Re: Bent PINDA mount

Talking of wheels I have just replaced/rebuilt a set of steel wheels with Hickory spokes. So we took a little from the Romans but we did bring the Industrial revolution after all. 😉

I cannot see the pinda being broken itself. I do wonder if it is just the mount? You have everything black so is it possible to change back to the stock orange one? or is this a MK1 upgraded?