Re: vertical lines
Maybe a dumb question, when comparing same model printed at MK1 and MK2, are you using identical slicer settings?
Looking at the pictures it looks like those steps in arcs coincide with infill (or gap filling) pattern, so maybe the interaction infill-wall is causing it?
Try reducing infill overlap? Or change the printing order of perimeters-infill? Or maybe add more wall perimeters? Or disable gap filling?
Re: vertical lines
Thanks Luis, not dumb I'll take all the help I can get.
Slicer settings - both were working from the basic settings PR were giving out at the time and adjusting from there. I got my mk1 quite recently so there isn't much difference. I can't guarantee that they're exactly the same but I've covered enough experiments in each slicer to be pretty sure this isn't a slicer issue. Multiple slicers and different infills/overlaps/speeds/temperatures/accelerations etc. Even printing different sizes, the pattern not only looks the same but has exactly the same dimensions.
For example, if you look at the top down image from my original post - that uses 3 perimeters, printing the outer most first, 3 on the inner tube, three on the outer, and a 20% infill in between, I think - they don't line up. It could be hollow and it will look the same, the pattern is even visible in the infill (probably not in that image but generally it is).
When I get a chance I'm going to rewire everything to ensure it's not some form of interference, I'm pretty careful about that aspect so I'm not yet sure how I could improve it.
Re: vertical lines
Would you please post the G-code, so we may try the print here at Prusa Research?
Thanks, Vojtech
Re: vertical lines
I was reading this post and decided to check my prints and I guess I can see faint vertical lines sometimes but not all the time.
On this print (.35mm layer height, print speeds under 50mm/s) I didn't notice anything except for a couple seams from the extruder changing perimeter.
[attachment=0]20160807_010042[1].jpg[/attachment]
On round prints with smaller layer heights I do notice vertical lines if I look very very closely but it won't show up in picture. Usually I print under 40mm/s.
Re: vertical lines
Jorge
There has recently been a discussion going on in the Czech forum about vertical lines; don't know the outcome as I haven't looked for a couple of days, but I think Vojta is looking to make/has made some adjustments in the firmware to reduce this.
Regarding your layer height, as a general rule your layers should not be more than 80% of the nozzle width.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: vertical lines
Jorge - Thanks for contributing , I've noticed the same thing too. I've been printing everything in 0.2mm recently as it is a significant improvement on quality with the same models that look pretty bad at 0.1mm. It's not ideal, but has been ok for recent prints. Speed isn't a significant factor at 0.1mm, the lines are still present, just shift depending on speed changes.
Peter, can you send me a link to the discussion that you mentioned please?
Vojtech, I have so many versions now, I'll have to dig through. But The pic I posted was just the standard S3D 0.1mm settings from the forum on a tube that was about 4cm wide. But it's the same on standard slic3r too. I've yet to find any settings that can get rid of it other than thicker layers. Lower/higher model resolution doesn't seem to be a factor either.
cheers.
Re: vertical lines
Michael
Here is the link: http://shop.prusa3d.com/forum/original-prusa-i3-mk2-f22/pravidelne-vertikalni-linky-na-vytiscich--t1228.html#p11102
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: vertical lines
I Google translated vojtěch.b3's last post on the problem from the Czech language forum:
It seems that we have three or four different problems:
1) Stuttering Planner. I tried to optimize it, I deliver alpha. Stuttering Planner can be prevented coarser discretizing STL model.
2) Lack of accuracy and power stepper motors and drivers. Particularly manifested in the silent mode.
3) Ripples diagonal printing. Apparently the problem is Bresenham discretization moving XY axes. Https://en.wikipedia.org/wiki/Bresenham _algorithm ... I tried to leave in an experimental firmware interpolation run slower movements (ie, so that it could make processor), 2x or 4x faster than the fastest axis. The results are promising, and perhaps it will have an effect, especially for the outer perimeters. Interestingly, it can not Marlin (from our Prusa Research it will be able to), but it does Sailfish firmware by default. 4) Perhaps someone makes the problem of movement of the extruder. Points 1 and 3, with a little luck I upgrade the firmware 3.0.7. Paragraph 1 therefore stutter Planner will never work enough for super close-G-codes. Vojta Bubník
So it appears he has tracked down the problem(s) and is doing his best to fix them...
Re: vertical lines
Vertical lines/Banding too!
I've been working on my mk1 to mk2 upgrade. I had issues with calibration and the frame not being square but was finally able to get through calibration successfully and the remaining calibration steps. When using simplify3d (Prusa forum downloaded rec settings) I am getting an even vertical line pattern (almost even). Not real sure what the problem is and I know I need to do some more testing and prints. I am thinking my extruder idler screws are too tight. The pattern is quite uniform as u can see by the photo.
I printed some 40mm squares (not a perfect square as the ht is not 40mm) at three different resolutions 0.2, 0.1, 0.05--again using prusa forum settings that are available for download.
Any comments or thoughts would greatly be appreciated. Thank you in advance.
Re: vertical lines
I'm experiencing vertical line issues on my mk2 prints too.
Here's a 1 minute video of the issue:
Here is a link to the exact gcode if you wish to give it a try yourself: http://www.filedropper.com/mtjcprintsurfacetest
Re: vertical lines
*bump*
Anyone have any updates regarding this issue by any chance?
Re: vertical lines
Looking for something as well. I have greatly reduced mine by slowing outer shell printing to 20mm/s but they are still there, and thinking they are related to some kind of frame vibration (they are on both axes).
Is there any particular thing I should look at to reduce the resonance?
Re: vertical lines
All,
I have printed some Nema17 vibration dampeners out of flexible TPU. I will be installing these and report back with results. I have a feeling based on the comments that they should reduce the vibration enough to stop the resonance from affecting the prints (if this is indeed the problem).
http://www.thingiverse.com/thing:838816
Here's a pic of the product printed at .2, 100% infill, 215C extruder, 30C bed, black SainSmart TPU, 20mm/s.
Re: vertical lines
Hey 🙂 I'm having the same problem and it is kind of driving me nuts. Glad to hear i'm not the only one. I tried the dampeners and it made things actually worse for me. It made quite prominent ripples out of the faint small ones. Anyone having heard anything new?
Re: vertical lines
I've tried a variety of mechanical changes like a Y-Axis dampener and still have the same problem. Changing the outer layer speed to something other than 30mm/sec improves but does not eliminate the problem.
While searching around, I ran across these - https://www.aliexpress.com/store/product/TL-Smoother-addon-module-for-3D-pinter-motor-drivers-free-shipping/1654223_32776922807.html?spm=2114.12010608.0.0.0saQU9
They appear to be compatible with the A4982 stepper drivers the Rambo mini uses.
Has anyone tried these? Will they plug right in to the connectors on the rambo?
Re: vertical lines
I've tried it with the tpu vibration dampener. no success. It really buggs my. My wahao had a better surface then this machine...
Re: vertical lines
I got the same issues.
They are more prominent on ronund shapes and diagonals.
but also visible on the x or y axis walls.
Was very pleases with the printer, till i noticed them.
I tried switching between high power and silent mode.
Reduces printing speeds.
tightened and looesened the belts.
Reassembled the whole y carriage.
Printer states he is perpendicular. Althout i could not get it perpendicular, when i tried to hold the 100mm distance from the frame. i had to screw one side a liitle bit towards the rear of the printer.
Wich Firmware do you guys use?
Have you installed the MK2S Upgrade?
Have you "tilted" the two bearing towards eacht ohter on the carriage?
I think its a belt or motor issue. it looks like "stepping" artifacts to me.
it drives me crazy, because a friend of mine with his 180€ Anet A8 has no issues with this.
Re: vertical lines
Soo i could get rid of them by reducing the outline speed to 20% As you can immagine the prints take a loong long time then... I guess that's not rly the idea.
@bjoern.e
I use the latest Firmware, on an MK2S
I have used Misumi bearings and am currently using Polymer Bushings. - That had no effect on the print quality.
What do you mean by tilting the bearings together?
Re: vertical lines
I noticed the same problem just in the X axis when printing a round object.
In my opinion it has something to do with the teeth of my X belt grinding on the idler pulley.
This grinding happens because the belt is not properly aligned with the idler.
When the printhead moves closer to the right side of the X axis the grinding gets worse because the misalignment of the belt gets worse.
I shift my print objects around the bed for even wear of the axes and PEI 😉 and I only noticed those lines when printing closer to the right of the X axis. The right idler pulley grinds on the belt as can be seen here:
The vertical lines are very consistent across the layers. Every tooth off the belt represents one vertical line.
That's my theory 🙂
Re: vertical lines
I don't think it can be purely the belts; we would have seen similar issues on the mk1 and on other printers of this type, there are so many repraps like this.
I've been too busy to do much printing recently or keep up with the forums - has the mk2s upgrade helped anyone with this issue? I'm a bit wary of upgrading after this happened from mk1 to mk2.