XYZ Calibration - paper is moving  

RE: XYZ Calibration - paper is moving

Per reading the manual: PINDA is too high and must be lowered.  Have you done that?

RE: XYZ Calibration - paper is moving

Hey Tim, you again. Thx for the quick response.

No I didn't lower the PINDA yet. I calibrated it earlier with the thickness of a tirewrap. 

But because the printed object wouldn't stick  and  with my earlier printers the leveling could be a problem. So I wnet to the calibrating proces again.

Which page of the manual are you referring to?

RE: XYZ Calibration - paper is moving

I'm waiting for an answer in another thread ... lol.  I spend way too much time on line.

Page 19 of the handbook.

6.3.5 Calibrate XYZ (kit only)
The Original Prusa i3 MK3S comes with a full mesh bed leveling feature, however,
for this to work, we need to first calibrate the distance between the tip of the
nozzle and the PINDA (Prusa INDuction Autoleveling) probe.
The process is fairly straightforward; so let’s get to it.
The purpose of the X/Y/Z calibration routine is to measure the skew of the X/Y/Z axes and to
find the position of the 4 calibration points on the print bed for proper bed leveling. You can
run the XYZ calibration from the Calibration menu on the LCD panel. This should not be
necessary on the assembled printers as those are factory calibrated.
Place a sheet of a regular office paper (for example, the checklist shipped with
every order) and hold it under the nozzle during the first round (first 4 points
being checked) of calibration. If the nozzle catches on the paper during the
process, power off the printer and lower the PINDA probe slightly. See more
info in 6.3.10.2 Check probe height. The paper will not affect the calibration
process. The nozzle must not touch the print surface or deflect the bed by any
means. If everything went correctly, continue with the calibration process.

RE: XYZ Calibration - paper is moving

Regarding the print sticking, have you adjusted your Live Z? The XYZ calibration and adjusting the PINDA probe gets you close and then you fine tune the nozzle offset from the bed with the Live Z adjustments. For reference mine is around -0.3.

RE: XYZ Calibration - paper is moving

Thx, another RTFM again. When I was working in the IT business with a big Telecom Company in the Netherlands the helpdesk guys complained about the users who were not able to read the manual. So the RFTM was born (Read The Fucking Manual).

So now I'm one of those users that are lost in the information jungle.

Thx again and I'll try to RFTM.

Martin

RE: XYZ Calibration - paper is moving

Once upon a time we produced manuals that included:

1. General info;
2. User Instructions
3. Specifications
4. Theory of Operation
5. Schematics
6. Parts lists
7. Service Guidelines
8. Calibration Guidelines

And I watched as that changed over the years to a single sheet of paper with the words "User Guide" ...  The instruments were just as complex.

RE: XYZ Calibration - paper is moving

Oh - as for ARH TEE EFF EMM - been there.  I have seen that Prusa is not managing the information they provide very well.  There doesn't seem to be any central point for reviewing all the information they provide. A marketing foo-pah they are making.  They have manuals, guides, build instructions, blogs, videos, and sundry other support available: but no central repository that lets users find what is available. 

Prusa makes the mistake of asking users to search for it; so search results are governed by Google, and are generally not relevant to what a person actually wants to find.  Please: give me a landing page that points to sources of information that has already been created at great expense that can help me solve this problem. Call it an INDEX or Table of Contents.

Try navigating the Prusa web sites to find a build manual; or the user manual.  It's a navigational morass.  If you don't know they exist and generally where they're located, you won't find them. 

RE: XYZ Calibration - paper is moving

That could be a possibility, if we (the IT) would stop delivering more and more complexity in out products.

They compare cars often with computers. The core functions of a car hasn't changed over the years, the functionality of computers are changing dramaticly. 

RE: XYZ Calibration - paper is moving

Also not every PINDA probe switches at exactly the same height, there is a small variance possible.

Mine falls into the camp where if you follow the instructions to the letter, it will drag the paper, actually it drives the paper into the bed resulting in a panic to stop the printer.

I just adjusted the PINDA a little lower so that the paper would not get dragged then carried on with the calibration. After finishing everything I found an old hotel door pass someone left lying around at work is the exact height I need to set the PINDA to if ever I move anything.

RE: XYZ Calibration - paper is moving

The chore of resetting heights after a nozzle change ...

RE: XYZ Calibration - paper is moving

Hence, my PINDA height gauge. Makes that chore simple and repeatable for me.

https://www.thingiverse.com/thing:3555647

Problem with zip tie... which portion of zip tie. Is it the same zip tie maker? Variability.

Make the PINDA height gauge. Lap it to 0.8 mm and you can reproduce PINDA height well enough that live-Z ends up within 0.050 mm of your usual offset every time you rebuild the extruder.

RE: XYZ Calibration - paper is moving

Hey  Guy,

cool tool you've made.  Yes a zip tie is not very accurate. Prusa adviced me that (but that shoudn't stop me from thinking) in the Preflight check, chapter 9 of the Assembly Instructions. The zip tie I used was 1.3 mm. Chocki used a rfid (hotel)card. I measurd one and that's 0.8 mm. So that's a big difference. I didn't print your tool yet, so I don't know the thickness of it.

Anyhow I did the First Layer Calibration and my Prusa is printing fine.

Thx folks,  Martin

RE: XYZ Calibration - paper is moving

Some folk use thinner gauges because they use other bed materials that require a bit more "wiggle room" for autoleveling.  painters tape for example... if you use the 1.15 mm cable tie, then tape the bed, the nozzle may dig into the tape even with Z-offset at 0. A 0.8 gauge gives you an extra 0.35 mm to work with.

RE: XYZ Calibration - paper is moving

Also know that YOUR best live-Z will differ from that of others depending on the height they set their PINDA (and also which build plate they use)

For instance, darcshadow said his live Z is -0.3 mm. His is with PINDA is probably installed up higher than mine.

Mind with PINDA mounted 0.8 mm above nozzle is -1.200 to -1.000 depending on which build plate I am using.

RE: XYZ Calibration - paper is moving

I agree.  My PINDA has a height of 0.8 now and my life Z is around -1.0 mm. I cleaned my steel sheet with ammonia and I have a perfect adhesion now.

I love my Prusa.

RE: XYZ Calibration - paper is moving

Here is the secret: The zip tie (or credit card) ensures your nozzle is not above or below the Live-Z adjustment range. It only needs to be approximately correct.

Once you get the PINDA height approximately right with a zip tie, Live Z calibration will dial it in perfectly.

Live-Z can only adjust in a small range. The zip tie gets you within that adjustment range.

I hope this helps the people who are sent here by Google.

Cheers,

Tom