On official Bambu FB group, some one posted this :
Hope it could help many of you, results are pretty impressiv
1 Like
Quite a few of us here do not, can not, shall not facebook. Can you copy and paste?
1 Like
For reducing surface artifacts by mechanical adjustments there are a combination of factors that need to be considered, X-Y squareness, equal belt tension and belt rub on the idlers flanges. All these need to be addressed and will interact with each other during the adjustment process. Itās a subtle adjustment and very easy to go the other side of the bell curve giving the impression that the adjustment has had no impact. After careful and methodical adjustment to my machine the return to previous print quality proved that the issue was the squareness of the X-Y motion system and possibly belt tracking.
I think just holding the X gantry square to Y doesnāt give the required result. That is why I have a datum point (set square) that I adjust the X gantry to. This way you are able to see the effects of adding or removing preloaded from the adjusters. Both prints are done with the same filament and profile, the bottom print is after mechanical adjustments to gantry squareness and belt tracking.
and for the belt tracking :
7 Likes
Thanks for your writeup.
I only notice these artifacts on SILK filaments, since the Generic PLA Silk profile has a reduced max volumetric speed and thus prints slower.
Bambulab has released their own silk filamentsā¦ hopefully they have to do improvements on slow speed printing for them to nicely print.
1 Like
Itās not clear how did you solved. Could you esplain how did you fix it? Thanks
2 Likes
I had mentioned previously that the belts tracking up and down on the pulleys could give artifacts if they were to touch the shoulder of the pulley
Another member in here had told me that was not an issue as the belts donāt track that high or low
Soooooooooo, was I onto something there ?
If thatās the case a smooth belt guide could keep the belt alignment and tension tolerances tighter but possibly at the expense of accelerated belt wear 
Ugh, so many ideas so little time
Iāve got far more projects than time for but I am making progress on a print bed project and dual auxiliary cooling fans prototype so thatās a good thing lol
1 Like
I just forwarded a facebook post that I found helpful for those who experience this issue (actually, Iāve been waiting for mine for a week nowā¦).
In my opinion, the belt tracking is important on the one hand to avoid wear related to friction and on the other hand to avoid a force that could harm the fluidity of movement
We canāt run a taller set of idlers but I wonder if a narrower belt could help
1 Like
Just watching this video and wonder if the extruder gears in the Bambu play a part? Slower speeds mean slower extrusion, printing faster may help as the filament flow is under more pressure than at slower speeds?
2 Likes
The root-cause is not the time-belt but something different. It is also not caused by the extruder gear.
I spend a lot of hours of testing and researching and am now 100% sure where the root-cause is and how it could be solved by Bambulab.
You can use a speed-tower to test the size of the pattern based on speed. It does not matter which one, but most important is to have speeds below 120 mms included, so you can notice the pattern differs per speed.
You can e.g. select the 40-220mms speedtower that I have created on printables, model 415784
I am communicating with Bambulab support, but unfortunately Iām dealing with Rick. Rick is very capable on communicative and manipulative area for pushing problems away from his person and letting other people do his job. But not the right person if Bambulab wants to improve with a real solution. Unfortunately Bambulab support (in the person of support-employee Rick) only wants to camouflage by providing different settings or other advise not being a true understanding and solution to the root cause.
At this point Iām curious if Bambulab as a company wants to be solving the issue or keep avoiding and waving it away.
1 Like
Share with the rest of us, what you believe to be the problem, and the solution. I am curious to know what it is.
The community may be able to help getting this through to āNot Rickā at BL Mothership.
2 Likes
I understand your curiosity and your need for the solution. However, sharing it here will not solve it. It can only be solved by Bambulab.
Furthermore, it is not related to open-source but to the commercial part of Bambulab aimed at making profit.
Would you spend a lot of hours working in favour of a company aimed to make profit without receiving a fitting compensation?
Below 120mm/sec you are seeing stepper cogging(mrr). Above 120mm/sec you see belt pattern rippling till around 180/200mm/sec.
The stepper cogging (mrr) is not constant with speed hence the spacing being wider/narrower as you move up / down in the speed range.
The belt pattern rippling is constant and independent of speed. It just fades away as the speed getās higher.
For 1 you canāt solve unless you implement better micro stepping or tuning of the drivers to the stepper motors. Or use 0.9 degree steppers that will increase the frequency of the resonance making it less visible. Also slowing down to 20mm/sec makes things a lot smoother.
For 2 not sure what the answer is. Maybe itās the belts rubbing against the flanges or belt resonance that can be tuned with increased or reduced belt tension.
References:
5 Likes
Well if you are looking to turn a profit on what you think is the solution, best of luck.
Even if you are right, and this is the key to the ringing, I would be very surprised indeed if you got anything from it, especially if you are holding it ransom.
Were I the company, who by and large has a massive success going, and some owner of my product knocks on my door and says;
āHey, I found the issue that pisses off 1% of your users/potential repeat customers, but I want a cut before I tell youā
Iād tell you to have a nice day, and thank you for buying my printer.
This is not a make or break issue for Bambu Labā¦at all.
This is an issue for probably less than 1% of the users, and itās cosmetic only, and only on certain types of prints. Less impact than the warped bed, which they admit to and are working on it.
2 Likes
For around $1,500 for a āpremiumā printer with the AMS it is beyond frustrating. Iām wasting a bunch of filament just to get āless ringingā. A solution would be nice.
2 Likes
I agree, a solution would be nice.
Remember, this was marketed as a FAST quality printer. Stupid fast. Most owners are printing small stuff and donāt know itās there. I did not find mine until I printed a cup holder adapter for my car, and even then you have to catch it in the light just right. Does not affect performance.
Those that are using it for cosplay, I suspect that it can be washed off in the vapor bath. Nobody has said either way.
1 Like
Frankly, yes, and I think I did it many many times 
just think of all PrusaSlicer contributorsā¦
4 Likes
I am experiencing similar issues. Pretty large artifacts on x in z direction (amplified on larger prints with big planes) and similiar though smaller artifacts on y in z direction. I am a design student in Germany and participant in FSAE. Therefore I wanted a printer which is fast, works and is precise. Latter the Bambu canāt fulfill rn.
I already Submitted a Support Ticket 7 Days ago, but no reply yet.
If they donāt publish a fix soon, I probably have to file a warranty claim next.
does anyone know how to upload pictures into the thread?
If I try to upload some it says I cannot embed media elemets into the thread.