My experience/problems with MK3

Tiago

(@tiago)

Reputable Member

My experience/problems with MK3

Hello,

When i saw the MK3 for the first time i fell a great happiness, but now i'm a bit desperate
After more than a month of having the printer here the problems i had with: (pre R2 parts)

X Belt is heavy twisting, is rubbing agaist the idler and is getting sanded by the idler (Can see belt dust inside the plastic holder)

Extruder body, everytime i unload filament it get stuck inside! it will not pass the gears, i have to cut it and load that, i try many adjustments without success.

SDCard don't work proper, after random times printer stop printing, like abort without any warning or message on LCD (I have changed to another card and it solve the problem, still i deserve a functional card as it is already included)

Power Panic don't work well to me, i was printing a 12h part, at middle of progress power goes off during 2 minutes, when i get online again printer ask if i want to resume, i said "YES", it start to heat up, when reach the temperature the head just move a little back on Y and then nothing happen, just stay there without move or print, beside that LCD show printing a file from Prusa stock files which are not the file i was printing

Filament sensor Don't work right, false triggers that cause prints to fail and layer defects

First Layer never comes out good, every new print the layer is different, not matter what i try i have to ajust live Z on fly every print, not to mention that if i print ABS printer start to print on middle air, thats a huge offset and a pain!

Crash Detection I'm getting lot of crash detection on Y last days, i'am near the printer and i don't hear any real crash, it just dectect and go on, but when the print finish the model is good so i don't understand why i'm getting that detection, Y belt is tight and bed movement is smooth, the only thing i notice is the bed cable + nylon do a lot of force on bed, which is not good IMO, it can pull bed alone on top Y and pull at bottom Y (when steppers are OFF).

Bed is slight wrap, my bed is a bit deformed, the right side or left side have a slight angle depending on where i put the horizontal ruler

These are the problems i'm facing with almost everyday and i fell exhausted, is a battle to get a perfect layer and i end to spend a lot of filament just for geting this done.
Right now i fell this is not a good product for people who need reability and easy of use, some features are broken and need fix, so i end to disable every smart feature filament sensor and crash detection, they make more damage than good to me. I get much better results with that disable and power panic so far is useless to me, when print at high temperature it will not have time to save and printer instant shutdown.

The only positive thing i can say is the steel sheet, they are amazing and very usefull, noise levels are outstanding but with all that problems so far i regret to sell my trusty MK2S.
Overtime they can fix things up but in meantime this fell like a cheap and broken product, or maybe i got one unit so early and a bit of bad luck

PS: This is just my experience

Posted : 09/03/2018 5:42 pm

stahlfabrik

(@stahlfabrik)

Honorable Member

Re: My experience/problems with MK3

The 1st layer issue will be fixed. That is what I expect. Would be crazy otherwise.

I struggle the same way with that like you.

I will post later about that bug. Should be an interesting read.

I also had the x belt wiggle. The r2 parts mostly solved it so the belt does not get sanded anymore

Filament Sensor. I also get false positives. Sucks.

The extruder. I used a 2mm drill to clear The filament path so that the filament does run freely through the printed part

Power panic: never tried it. I was fed up with the issues I had already

Posted : 09/03/2018 6:09 pm

Dewey79

(@dewey79)

Honorable Member

Re: My experience/problems with MK3

Check for part upgrades. Sounds like you have an older MK3. Below is a link to the rubbing problem, but you should look for R2/B6 part updates. These will correct most issues. Once I receive my MK3 I'll be looking to see if they are all R2/B6 parts and will download and print anything I don't have.

R2 is what is the manufactured part and B6 is the stamp on parts you download from... let me find the download or link.... 2nd link

https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/many-new-printed-parts-on-github-t14261.html#p68765

https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/new-printed-parts-version-r2-b6-t14551.html#p70487

Posted : 09/03/2018 6:11 pm

Chris

(@chris-16)

Reputable Member

Re: My experience/problems with MK3

These are the problems i'm facing with almost everyday and i fell exhausted, is a battle to get a perfect layer and i end to spend a lot of filament just for geting this done.
Right now i fell this is not a good product for people who need reability and easy of use, some features are broken and need fix, so i end to disable every smart feature filament sensor and crash detection, they make more damage than good to me. I get much better results with that disable and power panic so far is useless to me, when print at high temperature it will not have time to save and printer instant shutdown.

The only positive thing i can say is the steel sheet, they are amazing and very usefull, noise levels are outstanding but with all that problems so far i regret to sell my trusty MK2S.
Overtime they can fix things up but in meantime this fell like a cheap and broken product, or maybe i got one unit so early and a bit of bad luck

PS: This is just my experience

there are fixes for most of the issues you have already.

X Belt new parts are available to print on git and on this forum to resolve this, y belt and z. printing parts to fix things is probably one of the reasons you bought the printer

Extruder body, I've have had good success with extruding 20-25mm of filament directly before unload. try it and see if it works for you

SDCard contact support, it is likely under warranty

Power Panic this might be an effect of the bad card you had

Filament sensor I believe failing to rehome correctly is resolved in 3.1.2 firmware

First Layer To solve this preheat before each print so everything is stable. I also have done a calibration first layer print so i have down what my live z needs to be set at for each filament before i try it.

Crash Detection first and important. prusa has suggested removing the spiral wrap and the nylon as they are confirmed to cause issues with the bed. additionally I found that my bed therm wire which is supposed to be a little loose was getting caught between the carriage and the frame so i zip tied it to the carriage to stay out of the way of the frame

Bed is slight wrap, all beds are on all printers. that is why mesh bed levelling is available to resolve it.

Posted : 09/03/2018 6:17 pm

Tiago

(@tiago)

Reputable Member

Topic starter answered:

Re: My experience/problems with MK3

there are fixes for most of the issues you have already.

X Belt new parts are available to print on git and on this forum to resolve this, y belt and z. printing parts to fix things is probably one of the reasons you bought the printer.
A: I anwser this above, to complete about the reason why i buy the printer is not only that, is because i had great experience with Mk2s and the quality is great, so as mk3 should be way better, i have early buy because i hope they release a perfect product near 0 problem based on previous experience with older models, i didn't except so much problems. Even if we want to upgrade mod etc, i think everybody want a good working product out of the box without have to mod it. Is like buy a smartphone and have to solder modules for it work as advertised...
------------

Extruder body, I've have had good success with extruding 20-25mm of filament directly before unload. try it and see if it works for you
A: I will try that, but it will end in same thing, currently i'm cutting the stuck filament and load it with the new, so extrude 20mm or cut 20mm will end on same 🙂
------------

SDCard contact support, it is likely under warranty
A: That issue is not critical to me, 8GB card is cheap and easy to buy and i already replaced with FlashAir, i also use more octoprint and that never failed to me...
------------

Power Panic this might be an effect of the bad card you had
A: Can't be, because i was using new card (FlashAir W-04) and that card never failed so far.
------------

Filament sensor I believe failing to rehome correctly is resolved in 3.1.2 firmware
A: Even with new rehome sometimes current layer will not be perfect ajusted with the new extruded one after a resume
------------

First Layer To solve this preheat before each print so everything is stable. I also have done a calibration first layer print so i have down what my live z needs to be set at for each filament before i try it.
A: I tried everything, pre heat 10m, 20m no matter, result will vary with same fillament, same file, i also test different Z height for pre heat, for me what work best is ajust Z when print starts. (I have black original PINDA)
------------

Crash Detection first and important. prusa has suggested removing the spiral wrap and the nylon as they are confirmed to cause issues with the bed. additionally I found that my bed therm wire which is supposed to be a little loose was getting caught between the carriage and the frame so i zip tied it to the carriage to stay out of the way of the frame
A: I already order a braided sleeve to improve that, hope that can solve this problem. About cables are ok.
------------

Bed is slight wrap, all beds are on all printers. that is why mesh bed levelling is available to resolve it.
A: I agree with this, problem is if i do a bed print test with a perfect Z center, the sides are just garbage and nozzle will rip the layer on some corners

Also i'm not seeking help for this problems, i daily read the forum, i know the problems and i try to solve but they are to much to be happy 🙁

Posted : 09/03/2018 7:48 pm

Tiago

(@tiago)

Reputable Member

Topic starter answered:

Re: My experience/problems with MK3

Also today i'm experiencing other problem that i never saw before... I'm unable to print, when bed calibration meet the 3th point (Bottom right) it cancel and show this message: "Bed leveling failed. Sensor didnt trigger. Debris on nozzle? Waiting for reset."
I haven't change anything, and after 6 tries the error happen always at same point...
PLA
If i do a Z calibration from menu it finish without problem.

What can be? I will do a XYZ cal again...

My PINDA is not mounted in a 90º angle, due to nature of the mount and the screw, it force pinda have a slight angle, is it normal? Can that be a source of some problems i'm having with layers?

EDIT: I have done the XYZ cal, and same happen, while cal XYZ the right side trigger instant and skip that, what is going on here? :O
Lately i was printing ABS with 120ºc/115ºc bed, can that damage magnets?

Video of the problem:

Last print i have made yesterday before this problem, ABS, 0% infill, 0 bottom solid:

Looks good so i don't understand where that error come from now

Posted : 09/03/2018 7:50 pm

Tiago

(@tiago)

Reputable Member

Topic starter answered:

Re: My experience/problems with MK3

Ok i found the problem of the PINDA... i notice the red light from pinda goes away when on bed right side, so i guess was the wiring...

I contact support, but as this have no warranty they told me to buy a new one. As i don't want to wait i have localized the position of the break and cut the cable and solder the 4 cables and isolate everyone. Printer is working again!
As a advice do not overtight that zipies, also the nylon was smashing the cable... The pinda cable is very fragil, very small wires (4), i bet the grey pinda is much more better in that aspect, the cable seens to be thicker

Posted : 10/03/2018 5:56 am

stoofer

(@stoofer)

Estimable Member

Re: My experience/problems with MK3

Also today i'm experiencing other problem that i never saw before... I'm unable to print, when bed calibration meet the 3th point (Bottom right) it cancel and show this message: "Bed leveling failed. Sensor didnt trigger. Debris on nozzle? Waiting for reset."
I haven't change anything, and after 6 tries the error happen always at same point...
PLA
If i do a Z calibration from menu it finish without problem.

What can be? I will do a XYZ cal again...

My PINDA is not mounted in a 90º angle, due to nature of the mount and the screw, it force pinda have a slight angle, is it normal? Can that be a source of some problems i'm having with layers?

EDIT: I have done the XYZ cal, and same happen, while cal XYZ the right side trigger instant and skip that, what is going on here? :O
Lately i was printing ABS with 120ºc/115ºc bed, can that damage magnets?

Video of the problem:

Last print i have made yesterday before this problem, ABS, 0% infill, 0 bottom solid:

Looks good so i don't understand where that error come from now

I had this exact issue. Support offer a general tip of "Factory Reset -> Flash Latest Firmware -> Factory Reset (again) -> Calibrate" and it worked for me.

Posted : 10/03/2018 2:03 pm

Chris

(@chris-16)

Reputable Member

Re: My experience/problems with MK3

A: I anwser this above, to complete about the reason why i buy the printer is not only that, is because i had great experience with Mk2s and the quality is great, so as mk3 should be way better, i have early buy because i hope they release a perfect product near 0 problem based on previous experience with older models, i didn't except so much problems. Even if we want to upgrade mod etc, i think everybody want a good working product out of the box without have to mod it. If this is what you want then maybe wait until the very end to buy, nothing ever releases without bugs and it is not unusual to have to have several revs of software or hardware before perfection. For the mk3 the changes from the last model are substantial and for me they are the reason I wanted this printer but they are also the reason it is not perfect. And it will take time to perfect them. I'm sure the mk4 like the mk2 will be better out of the box but the mk3 is pretty darn good even right now.

[*]First Layer To solve this preheat before each print so everything is stable. I also have done a calibration first layer print so i have down what my live z needs to be set at for each filament before i try it.
A: I tried everything, pre heat 10m, 20m no matter, result will vary with same fillament, same file, i also test different Z height for pre heat, for me what work best is ajust Z when print starts. (I have black original PINDA)

Good news on this front, prusa Lukas responded to stafronic and said fixing 1st layer variability for all pindas is a focus of the next firmware. Timeframe is next week.

Also i'm not seeking help for this problems, i daily read the forum, i know the problems and i try to solve but they are to much to be happy 🙁

Wrong place to post then, this is a help forum, not an agony column. Other people read this, even people who haven't received their printers yet and we need to share knowledge about what fixes and workarounds exist. So they can hit the ground running

Ps your owl looks amazing!

Posted : 14/03/2018 6:10 am

shire

(@shire)

Active Member

Re: My experience/problems with MK3

I too have problems with 1st layer adhesion, the test strip along the front is okay, but then fails on the skirt, seems to drag string from test stip into skirt.
The problem which is difficult to fix is the lack of consistency, where to start when it is different every time.,
To help eliminate I did three prints, same job,filament and settings, first two failed, third perfect????
Repeated later 1st perfect, next two failed , where to start???
I seem to have to spend all the time cleaning bed, and setting Z

Posted : 12/05/2018 6:38 pm

shire

(@shire)

Active Member

Re: My experience/problems with MK3

no reply to this problem, or to emails to support,regarding this problem, so much for much vaunted support.
Anyone want to buy a virtually unused MK 3

Posted : 19/05/2018 5:02 pm

Tiago

(@tiago)

Reputable Member

Topic starter answered:

Re: My experience/problems with MK3

no reply to this problem, or to emails to support,regarding this problem, so much for much vaunted support.
Anyone want to buy a virtually unused MK 3

Have you tried to update to the last firmware?
Please make sure you start bed calibration at 35ºc each print.
Or calibrate temperature values

Posted : 19/05/2018 11:28 pm