First layer irregularity  

Re: First layer irregularity

It might be that your z tops are not both on the same height, or one is not fixed as well as the other. This would result in your X axis not being parallel to the frame

I would calibrate Z and then check visually that your X axis top rod is perfectly parallel to the frame top. So your x axis is parallel to the frame. If it is not you can manually turn one of the Z lead screws to make the X axis parallel to the frame. Then you could use the nylon method to make the bed parallel to the X axis.

Re: First layer irregularity

Thank you for your reply,

I tried to manually compensate the X axis but the problem remains because mesh bed leveling is correcting my manual compensation... I have the same results when I do a first layer calibration afterward.

Re: First layer irregularity

Hi guys,

Sorry to up the topic but I need some more help here :

I tried to use the 7x7 mesh bed leveling firmware and it increased the quality of my first layer but it's still not as good as what I would expect from my printer. I can't get an even layer from left to right.

I don't know what to do next... I didn't contacted the support yet...

Any idea ?

Re: First layer irregularity

try the factory reset and data wipe then start over at the preflight page in the user manual if you have corrupt data hiding anywhere this should clear it.

Re: First layer irregularity

some people swear by warming up the pinda probe to 35c then starting a print. (thus starting the mesh bed leveling with a temp of 35c)

I find I am having to preheat less and less. they must be messing with something.

Re: First layer irregularity

try the factory reset and data wipe then start over at the preflight page in the user manual if you have corrupt data hiding anywhere this should clear it.

Do you recommend me to uninstall nylock nuts and install back the genuine firmware before ?

some people swear by warming up the pinda probe to 35c then starting a print. (thus starting the mesh bed leveling with a temp of 35c)

I find I am having to preheat less and less. they must be messing with something.

Well... I tried something according this statement too... I use a start gcode which makes the printer waiting until PINDA probe is cooling down to 30°C then wait until its heating up to 35 then start to probe the bed.

I didn't notice any huge difference with this one too...

I'm pretty sure there is something to do with software... When I go to the support section of the firmware, it gives me an average measured skew of 0.09... This is my first Prusa Printer but according to the firmware, it's not even a slight skew...

Thanks for your help 😉

Re: First layer irregularity

try the factory reset and data wipe then start over at the preflight page in the user manual if you have corrupt data hiding anywhere this should clear it.

Do you recommend me to uninstall nylock nuts and install back the genuine firmware before ?

Nope. there is a chance that you might have to reinstall the 7x7 firmware but as I am waiting for it to be a part of the Prusa certified firmware I have no experience with it...
I was having problems with random layer shifts not linked to any mechanical problems and Prusa Chat support thought it was perhaps an intermittent PIND problem and sent me a replacement but after changing it the problem remained. then one of the heads of the support told me to try the reset and to chose the clear data feature and redo the getting started from the preflight paragraph of the user manual and all of this problems went away, so anttime I have a problem where I am sure I have checked any hardware possibilities and then reinstalled the current firmware; if the problem remains with a one of the presliced gcode files on the SD card I will do a Full Reset in the future.

Re: First layer irregularity

try the factory reset and data wipe then start over at the preflight page in the user manual if you have corrupt data hiding anywhere this should clear it.

Do you recommend me to uninstall nylock nuts and install back the genuine firmware before ?

Nope. there is a chance that you might have to reinstall the 7x7 firmware but as I am waiting for it to be a part of the Prusa certified firmware I have no experience with it...
I was having problems with random layer shifts not linked to any mechanical problems and Prusa Chat support thought it was perhaps an intermittent PIND problem and sent me a replacement but after changing it the problem remained. then one of the heads of the support told me to try the reset and to chose the clear data feature and redo the getting started from the preflight paragraph of the user manual and all of this problems went away, so anttime I have a problem where I am sure I have checked any hardware possibilities and then reinstalled the current firmware; if the problem remains with a one of the presliced gcode files on the SD card I will do a Full Reset in the future.

I didn't say that..

Re: First layer irregularity

@toaf I think it's a quote bug 😀

I'll try to do a reset then... I'll come back afterward to keep you updated.
Thank you guys again for your support !

Re: First layer irregularity

just something else to look at. make sure your hotend is in the plastic correctly. (the cooling fins flush at the bottom) i think i remember someone having it ibit tilted once.

Re: First layer irregularity

just something else to look at. make sure your hotend is in the plastic correctly. (the cooling fins flush at the bottom) i think i remember someone having it ibit tilted once.

Yep ! mounted flush in the plastic.
The only mechanical problem that I had and I should tell you about is that the armature was not exactly flat on the printer's feet when I tightened the aluminium extrusions to the frame. It was a very minimal bend so I didn't take the time to dig into this point. Maybe I should ?

Re: First layer irregularity

it shouldn't take too long

Re: First layer irregularity

Do you have an easy procedure to do so ?
I tried the one in the manual but didn't see the difference... Maybe I don't want to wrarp the frame too much...

Re: First layer irregularity

it should warp the frame as long as you loosen the bolts bit first. just been careful. some of the stuff is hard to get to with the printer assembled. just use the first part of the manual as a guide.

Re: First layer irregularity

One further idea (hope I have not overlooked it when scanning the previous replies) ... after switching to 7x7 and when you adjusting the nylocks, did you do that with the bed at target temp? Made a huge difference for me compared to room temp ...