Weird Exterior banding any suggestions?
Hello All, here is a picture of two prints of identical gcode on a older MK2 i3 and one on a much newer MK2 i3. All the other sides are identical and perfect except then one side shown in the picture. Printed with ABS. At first the prints off the new printer were identical to the old, but in the last few weeks this weird exterior banding has started to appear. Any thoughts or suggestions would be much appreciated and thanks for everyone's time in advance.
Re: Weird Exterior banding any suggestions?
Hi Jason,
It's better to attach photos than to give a url to a different repository.
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
Re: Weird Exterior banding any suggestions?
Gotcha Joan, appricate the guidance. Picture is now attached
Jason
Re: Weird Exterior banding any suggestions?
If you are talking about the "Shadows" after the hole, this is due to the bed or head bouncing after the direction change. This can be reduced or eliminated by changing the acceleration and/or speed values for the print. If it is developing or getting worse over time it may be due to wear on the bearings or guide rods, or the belt getting stretched and losing some tension, allowing the bed or head to bounce more. Most of the printers I have seen show this to come degree since it isn't possible to entirely eliminate backlash from the system while still allowing it to move.
Re: Weird Exterior banding any suggestions?
If you are talking about the "Shadows" after the hole, this is due to the bed or head bouncing after the direction change. This can be reduced or eliminated by changing the acceleration and/or speed values for the print. If it is developing or getting worse over time it may be due to wear on the bearings or guide rods, or the belt getting stretched and losing some tension, allowing the bed or head to bounce more. Most of the printers I have seen show this to come degree since it isn't possible to entirely eliminate backlash from the system while still allowing it to move.
Definitely not meaning the shadows, it's primarily above the logo and next to the top hole as seen on the one on the right in the picture off our much newer printer. The older printer has been laying this model down consecutively without any of the exterior items shown off the new printer. Thanks for the response though
Re: Weird Exterior banding any suggestions?
I think those are the perimeter start points. Try changing the slicing parameter from aligned or nearest to random. The latest version of the slicer has changed some parameters and I am still trying to figure out how to fix them on my MK2.
Re: Weird Exterior banding any suggestions?
I think those are the perimeter start points. Try changing the slicing parameter from aligned or nearest to random. The latest version of the slicer has changed some parameters and I am still trying to figure out how to fix them on my MK2.
Just makes the exterior worse as it starts at random points on the exterior and makes it exterior worse looking.
Main thing is, is that with the same gcode off the same SD card the prints off the old one look better then off the new. Now once again, the prints were great in the beginning off the new one and within the last few weeks the banding has started to appear. This picture is of the 2 silver ABS ones are off the new printer and the yellow ABS one is off the much older one. This side is the only side that shows this banding.
Re: Weird Exterior banding any suggestions?
Do the printers have different firmware?
Re: Weird Exterior banding any suggestions?
Do the printers have different firmware?
Yes sir, they were both updated one after the other when the new firmware was released a bit back. I'll be going over the machine fully once again as they both were pre-assembled and worked great for a long time and run a new test print. I've been pretty stumped but if all else fails above I might give it a new flash just to rule that out as well. Thanks again for the continued help all.
Re: Weird Exterior banding any suggestions?
I don't have any other ideas. Perhaps the firmware update changed the extruder calibration?
Re: Weird Exterior banding any suggestions?
Yes, downgrade to latest "good" firmware. I have long suspected that the firmware was made worser 🙁
I've similar issues on some parts. Same olde gcode files, but prints much worser.
Thomas
Re: Weird Exterior banding any suggestions?
Yes, downgrade to latest "good" firmware. I have long suspected that the firmware was made worser 🙁
I've similar issues on some parts. Same olde gcode files, but prints much worser.
Thomas
Gotcha Thomas, how would you go about downgrading? It just weird that our old printer running the same firmware does not make these artifacts on the exterior of the prints.
Re: Weird Exterior banding any suggestions?
Ahhh, it's not the firmware ? It's the hardware ? OK, in this case search for the differences of the printers. Something must be different.
I have the same "old" printer, but after a few firmware upgraded it prints not so good as the old. Don't know in which release it has changed, will test it if there is enough time to waste 😉
Thomas
Re: Weird Exterior banding any suggestions?
It could be the nozzle on the newest printer needing cleaning.
If the nozzle is starting to get clogged up with debris, the pressure will rise and blobs will form when ever the extruder is moving slowly or at stand still.
Just a thought.
Have a look at my models on Printables.com 😉
Re: Weird Exterior banding any suggestions?
OK, went over the newer machine today and all the bolts were nice and snug. Cleaned the nozzle and the belts seem to be fine, so I downgraded the firmware to the one before the latest version that was working fine. Well... Needless to say the banding is still there and very prominent on the inital test print as seen. The green body is from the much older PRUSA and the black body is from the new. Not sure where to go from here...
Re: Weird Exterior banding any suggestions?
The black part could be a little over extruded. If the filaments differ in diameter or the extrude steps/mm needs adjustment (or filament pulley is dirty).
The inner structures can show on the surface when over extruding, as the filament has nowhere to go but out.
Have a look at my models on Printables.com 😉
Re: Weird Exterior banding any suggestions?
The black part could be a little over extruded. If the filaments differ in diameter or the extrude steps/mm needs adjustment (or filament pulley is dirty).
The inner structures can show on the surface when over extruding, as the filament has nowhere to go but out.
The filiment is exactly the same size in diameter, as well are the extrusion rates of each. If it were over extruding, it would show on pretty much the whole model instead of just a random side I would suspect. If I took pictures of the remaining sides, they are all identical. Originally thought it was the Z seam, but that is not the case. Once more to relitterate, the new machine that is producing these artifacts just started to do this recently with no changes to the machine or gcode....so needless to say I'm pretty stumped.
Re: Weird Exterior banding any suggestions?
Just a thought....
Did you check your toothed gears and the belts whether there is some dirt/debris in it or even a tooth missing?
Re: Weird Exterior banding any suggestions?
Just a thought....
Did you check your toothed gears and the belts whether there is some dirt/debris in it or even a tooth missing?
Hey Alex, I did but just to make sure once you suggested it I went over the X & Y toothed gears as well as the belts and there are no signs of a missing tooth or any damage or teeth missing from it as well. Both X & Y move nice and smooth by hand when the machine is off...just a shot to show how much use the original one has on it printing just fine and the second shot is of the usage of the new printer. Just for reference both were pre-assembled and have worked great with regular maintenance. It's just these past few days the new one has magically made these artifacts appear in every print...ugghhh
Re: Weird Exterior banding any suggestions?
For me it seems it is something mechanical.
IS this the x or the y axis where the banding occures?
There has to be something where the movement stucks for a certain time.
If there is nothing to be found at the bearings, rods, belts and gears my next guess would be that the stepper-motor
at the corresponding axis may have some problem...
I know, it is a lot of work, but if they were mine I would change them back and forth just to check whether those blobs change
fro one to the other, too.
One more thought...
Change the position of your part on the print bed and check whether the blobs stay with the model or with the axis...