"Calibration Failed! Check the axes and run again"

Dave Durant

(@dave-durant)

Active Member

"Calibration Failed! Check the axes and run again"

Does anybody know what this error actually means? I've read lots of anecdotal stories about "I did this to fix it" or "Doing that made it go away" but never a real explanation of what the error actually means.

My MK2.5 homes great on X/Y/Z. The PINDA ends up exactly over the circle on the bed. The PINDA LED goes out when it gets close. Wiggling the wires does not seem to have any effect, anywhere along the X travel. Raising X all the way up then down and up again doesn't show any sign of either side sticking at all. Support had me reinstall the latest FW then factory reset, which did not help. Then back to the previous version and factory reset, which also did not help.

Does anybody know what this error is actually telling me? This "try stuff until the error stops" is a bit frustrating..

Postato : 21/05/2019 3:20 pm

patrick.r10

(@patrick-r10)

New Member

RE: "Calibration Failed! Check the axes and run again"

Hello,

I have the same problème

I apologize for the poor quality of my English.

When I installed the kit MMU everything went well,
At the end of mounting the manual instruction said to do the calibration of the Z axis, I did it and the message has been "calibration failed check the axes an run again"

I reverified all the axes to see if a displacement in x, y or Z was embarrassed : nothing, I checked the tension of the belt: nothing, I went to see on the forum, I followed all the steps of the link fja7hbb22y-xyz-calibration-error-messages-mk-3 "Calibration walkthrough", nothing;
the Z-axis nuts are tight, the X and Y-axis linear bearing too, the pinda is about a little more 1mm above the nozzle, there is nothing that blocks the x-axis when I move the axes with the function "setting" "move the axes "everything is fine, from one side to the other, when I do a self home the pinda is well above the mark, the hotend is in place and the most Surprising is that it worked well just before I've installed the MMU kit, and have changed the new fan for the update.
I do not know what to do.
Do you have an idea ?
I attached the video of what is happening maybe you will see something that I do not see.
https://share.icloud.com/photos/0kkVoR82LlZJH8VT_FiQx8Tbw#Domicile

https://share.icloud.com/photos/069KOJFhkj7Hkv_cgd62o7A_Q#Domicile

After the configuration has blocked when I go back to see the position of the axes in move axis, on the LCD screen, for X I am at +5.0, Y + 1.0 and for Z +5.0 and when I move the axes to go to the end of the side for x I can move up to 0.0, for y -4.0, and for z moving from graduation to +4.0, I touch the board.
Can you help me, thank you in advance

Postato : 24/05/2019 9:10 am

coopster

(@coopster)

Eminent Member

RE: "Calibration Failed! Check the axes and run again"

I too have the same problem as Dave-d5 above .. I just completed assembly of a mk2/s to mk 2/5s upgrade kit... like others have stated... belts are tight.. axis are all square... runs through the self check no problem...pinda lights up and when I hit auto home it will home fairly close to the circle on the bed.. I can get the x axis to go up and then back down I get the same error ""Calibration Failed! Check the axes and run again" "

im going to check the connections on the pinda vs the board , and maybe try flashing the firmware again... other than that dont know what else to try ...

Postato : 24/05/2019 2:12 pm

coopster

(@coopster)

Eminent Member

RE: "Calibration Failed! Check the axes and run again"

so this is what ive done so far

factory resets

re-checked connections

re-squared the x and y axis

re-flashed the current firmware

set power mode to high . left the print plate on

adjusted the belts

downgraded to firmware 3.6

nothing has worked... cannot get past the intial calibrate xyz .. when I autohome the pinda does not lineup in the circle.. ive adjusted and tried just about everything. this is extremely frustrating as I had a working 2ks before so it cant be any type of assembly problems.. my last ditch thing to try is to replace the pinda as I did buy an extra one when I purchased the upgrade kit...

stupid me for upgrading a perfectly working printer "if it at broke don't fix it" sure does apply

Questo post è stato modificato 5 years fa da coopster

Postato : 27/05/2019 9:07 pm

bryansp_ms

(@bryansp_ms)

Active Member

RE: "Calibration Failed! Check the axes and run again"

I am having the same problem as well. Support has not been helpful at all. I am so frustrated! I have a $800 paper weight. Support is saying how unusual the issue is and they have never seen it before, yet I see lots of people are having it. How can I send this thing back and get a refund?! Ugg... This was supposed to be a happy time but it's nothing but disappointments.

Postato : 28/05/2019 12:14 am

coopster

(@coopster)

Eminent Member

RE: "Calibration Failed! Check the axes and run again"

ok so I have been emailing prusa about this and after several emails regarding "mechanical" checks of the printer , they finally sent me a new PINDA … this in fact did solve my problem as my printer now works. (even with the auto home not totally aligned )

BUT before you go through the same process … double check your PINDA HEIGHT ! I would start with your extruder nozzle touching the surface and then work the pinda height from there.. it looks like its very sensitive … it may look like its close to the board but infact its too high and you get the calibration errors.. (took me several adjustments in height before I was able to get the printer to calibrate)

Postato : 02/07/2019 4:14 pm

Dave Avery

(@dave-avery)

Honorable Member

RE: "Calibration Failed! Check the axes and run again"

hint - emailing is a lot slower that the realtime chat on the shop page

Postato : 02/07/2019 5:01 pm

--

(@)

Illustrious Member

RE: "Calibration Failed! Check the axes and run again"

FACTORY RESET is not FACTORY RESET with DATA CLEAR. I'm not sure folks understand the significance and need for extra steps to get the DATA CLEAR to happen.

Postato : 02/07/2019 5:10 pm

coopster

(@coopster)

Eminent Member

RE: "Calibration Failed! Check the axes and run again"

I started with realtime chat.. it progressed to emailing , and yes I did factory reset and Dataclear

Questo post è stato modificato 5 years fa da coopster

Postato : 03/07/2019 2:03 pm

kitefiter

(@kitefiter)

Active Member

RE: "Calibration Failed! Check the axes and run again"

I was using the z-adjustment and discovered that 0.0 is not at the bed and the top level of 210 was never attainable. On another forum (MK3.0) I saw a suggestion to run the extruder all the way to the top, (manually if necessary) and turn the printer off. Upon restarting, the XYZ calibration was completed successfully. PROBLEM SOLVED!

Postato : 18/07/2019 6:10 pm

Simon B

(@simon-b-4)

Active Member

RE: "Calibration Failed! Check the axes and run again"

I just upgraded from MK2 to MK2.5s and I get this error. I don't know what's expected by the firmware when doing this first part of the routine ... my z probe is working and is at a reasonable distance from the bed ( ~ 1mm offset with the nozzle ).

So far nobody has a clear answer on what is causing this error ?

Postato : 20/07/2019 2:17 am

Simon B

(@simon-b-4)

Active Member

RE: "Calibration Failed! Check the axes and run again"

Update here : Got it to work by raising the PINDA probe by about 1 tick ( one thread tick ) and rotating the probe a little bit.

I noticed that the holder is quite weak and the probe has a slight angle, so turning it a little bit helped to discover the 1st calibration point.

Questo post è stato modificato 5 years fa da Simon B

Postato : 20/07/2019 2:23 am

--

(@)

Illustrious Member

RE: "Calibration Failed! Check the axes and run again"

I'm thinking most people find their assembly error and never come back to the thread to admit what they found.... lol. But who knows.

I've read the wrong firmware can cause it; the distance between stops can cause it; interference can cause it (wires or cable ties bumping the PS or controller case); unbalanced lead screws (one too low), or tight T-nuts; and so on. No single clear and definitive cause that I have detected.

Did you try william's solution?

And, have you read the Prusa blog post for troubleshooting this error?

Questo post è stato modificato 5 years fa da --

Postato : 20/07/2019 7:35 am

Simon B

(@simon-b-4)

Active Member

RE: "Calibration Failed! Check the axes and run again"

I might have found some evil code in the firmware ...

To confirm the calibration the function is :

if (st_get_position_mm(Z_AXIS) == MESH_HOME_Z_SEARCH)

{

...

"st_get_position_mm" returns a float from a division and compares it to an integer. So unless the number of step from the stepper/step count is EXACTLY 5 ... calibration will fail. A range would be more acceptable.

Also, one should never compare a float to an integer, it's not certain that the integer can be represented by a float. And the odd of having the exact same number is really low. ( I know that integers can be represented by floats but this applies to the general concept of coding C ).

Postato : 20/07/2019 9:46 pm

Simon B

(@simon-b-4)

Active Member

RE: "Calibration Failed! Check the axes and run again"

Wow I am getting my message deleted because it took too much time editing it ... I'll do it again because I think it's important that at least somebody understands it.

Calibration success is driven by :

if (st_get_position_mm(Z_AXIS) == MESH_HOME_Z_SEARCH)

{

And the get_position_mm is :

float st_get_position_mm(uint8_t axis)

{

float steper_position_in_steps = st_get_position(axis);

return steper_position_in_steps / cs.axis_steps_per_unit[axis];

}

**I am on the v3.7.2 right now

The axis step per unit is 161.3 for a MK2 and 133 for a MK2.5s ( bondtech ).

The thing here is that 161.3 in float is actually 161.3000030517578125 ( https://www.h-schmidt.net/FloatConverter/IEEE754.html )

So the code is expecting to get : stepper_position_in_steps/161.3000030517578125 to equal EXACTLY 5.

If your Z axis didn't travel 806.500015259 steps, it will fail. That makes no sens.

It should be something like :

float threshold = 0.10f;

if ((st_get_position_mm(Z_AXIS) <= (MESH_HOME_Z_SEARCH + threshold)) ||

(st_get_position_mm(Z_AXIS) >= (MESH_HOME_Z_SEARCH - threshold)))

{ ...

This would mitigate the math error.

Questo post è stato modificato 5 years fa da Simon B

Postato : 20/07/2019 10:11 pm

Simon B

(@simon-b-4)

Active Member

RE: "Calibration Failed! Check the axes and run again"

Note that I confused the exteuder and the Z step per axis which is 3200.

So the code is expecting 16000 steps exactly !

Postato : 20/07/2019 10:31 pm

Dave Durant

(@dave-durant)

Active Member

Topic starter answered:

RE: "Calibration Failed! Check the axes and run again"

So the code is expecting 16000 steps exactly !

Thanks. I've been poking around in this code, too. I put a printf in the else part of that check so I could see how much I'm off by. With the nozzle actually pushing at the bed at the end of this test, it still says I'm off by ~3.5mm. Going the other way and getting the PINDA lower does not seem to be the right direction.

I did have an issue where the long front-to-back threaded rods were not sitting all the way into the frame but I think that's fixed. Both sides are 8mm from the bottom of the frame to the bottom of washer on the threaded rod, if somebody is bored and would like to verify that that's right.

I'm at a loss on where I'm going to find an extra 3.5mm of Z travel. I was pretty happy with the machine then did the MMU1 "upgrade" and it's been all downhill since.. :\

Postato : 05/08/2019 3:01 am

Dave Durant

(@dave-durant)

Active Member

Topic starter answered:

RE: "Calibration Failed! Check the axes and run again"

Posted by: Tim

Did you try william's solution?

And, have you read the Prusa blog post for troubleshooting this error?

I did try william's solution but it didn't help. TY anyway.

Do you have a link to that blog entry? I'm not seeing it..

Postato : 05/08/2019 3:10 am

--

(@)

Illustrious Member

RE: "Calibration Failed! Check the axes and run again"

I use RECENT posts to filter, and often get wrapped around the axle posting in 2.5 forums with 3.0 info ... sorry.

Postato : 05/08/2019 7:12 pm

Dave Durant hanno apprezzato

rakucana

(@rakucana)

New Member

RE: "Calibration Failed! Check the axes and run again"

Posted by: dave.d5

Does anybody know what this error actually means? I've read lots of anecdotal stories about "I did this to fix it" or "Doing that made it go away" but never a real explanation of what the error actually means.

My MK2.5 homes great on X/Y/Z. The PINDA ends up exactly over the circle on the bed. The PINDA LED goes out when it gets close. Wiggling the wires does not seem to have any effect, anywhere along the X travel. Raising X all the way up then down and up again doesn't show any sign of either side sticking at all. Support had me reinstall the latest FW then factory reset, which did not help. Then back to the previous version and factory reset, which also did not help.

Does anybody know what this error is actually telling me? This "try stuff until the error stops" is a bit frustrating..

when I autohome the pinda does not lineup in the circle.. ive adjusted and tried just about everything. this is extremely frustrating as I had a working 2ks before so it cant be any type of assembly problems.. my last ditch thing to try is to replace the pinda as I did buy an extra one when I purchased the upgrade kit...

Postato : 20/08/2019 1:21 pm