Hi makers!
I have three Bambu A1 series ( 2 mini and one A1 ) eight months ago.
since then I print in TPU 95 every day and never I get a print with the quality of one of may before printers ( Ender S1 ).
If you see the picture, you can see a waves clos to the gemoetries changes of the wall.
I’ve try to solve changing the volumetric speed, the speed, the aceleration, the jerk, classic, aracne, outer walls first, inner first, the layer type width, flow ratio, the material…
Another thing I have detected is the inconsistency in prints with overhang angles… it seems as if the material is hanging down (in the photos you can see it at the bottom of the piece)
The picture is printed wit thesse parametters :
0,12 Layer
Volumetric Speed 2
Flow ratio 1.2
Fan always on
speed consistent 60
Temperature 203º
Acceleration 2000 or less ( I’ve arrived to downgrade till 500 )
jerk xy 9
External walls first.
I don’t know the actual cause of the defects you’re showing but how do you know the filament is dry? Many use filament dryers and put filament in at some temperature and for some time, but that unfortunately isn’t a guarantee of dryness. One way to know at least with a little more confidence it’s dry is by weighing before and after drying and noting the humidity in the filament dryer when drying was stopped.
Hello! Thanks for your reply.
I know it’s dry, because I dry it in the oven more than once and it’s not a matter of a specific roll of filament, I’ve tried a multitude of TPUs from different brands (SUNLU, NOULEI, BAMBUHF, GiantArm, Geetech, Smartfills) white… black… and most importantly… on the Ender S1 it doesn’t make those lines.
Is there something I’m missing or it’s a problem with the printer…
I thought it could be a vibration when accelerating, I changed and lowered the speed of all the movements, and nothing changed.
I’ve only noticed an improvement when printing without supports, although the supports are not at the same height (layer) where the waves appear.
Another thing I thought, logically, that it could be, was the speed of the fan, but it doesn’t seem to change when I print without it.
Is it the exact same roll of filament that gets lines on the Bambu but not on the Ender?
If so, that should mostly eliminate the filament but it could still just be something in the settings provoking the lines on the Bambu. Have you compared all the setting you can between the two printers?
Yes, not only one… all TPU I’ve commented… Only the TPU HF from Bambulab Has not been tested in the Ender because I sold the printer. ( too early I think )
With the A1 mini you can have problems with the diameter of the filament, i recommend you to try this hack i made for the A1 print TPU and TPE 70ShoreA
I always print with A95 shore.The filament is quite hard to have problems with the extruder. isn’t it?
I’ve follow your parameters, specially reduce the volumetric speed and I improve a lot the quality of the prints, but in some pieces (similar than I’ve shown) I have the issue I commented. I don’t know what is the next step…
By logics, The waves appears close to a geometry by a direction change. I thought It cand due the acceleration or deceleration…when this happens , every time the printer do this strong movement can move the printer and shake it the printed piece, generating this waves… but I decreased the aceleration and the empty movement to minimun and still appearing same way.
I’ve observe the movement of the extruder when are printing this part, and I couldn’t notice any extrange .
I think I know what is the problem! i think is the flow you have 1.2 and that is to high for a 95sha filament try make a 1.0 flow i think the MAXflorate is a little lo i think with that hardness you can use 3mm2. The temp for the tpus that you use is to low i use in the range of 230 to 245
First of all, thank you for taking the time to try to help me. THANK YOU.
I have tried printing at higher temperatures than those you mentioned and a flow ratio of 1. The result has been disappointing.
Only I I have only managed to make them disappear a bit, by lowering the JERK to 6, and increasing the resolution ( 0,02 and 0,005 ) … but the overhangs has been a disaster and the general quality has descrease also. Now I’m trying to find what is the reason.
Hi, sorry to hear your having issue like this. These things can be tough to find. I saw the same wave pattern you are seeing a few weeks ago, for me it was something to do with line width vs layer height, I increased from 0.1mm to 1.5mm and it just disappeared. Can say it will magically fix your problem, but might be worth a try.
Huumm i started 3d printing in 2010 on a materialize raptor machine SLA and i started REPrap for the early 2013 and I don’t understand what the problem can be !
I will be leaving this problem in my thots and if i remember something i keep you posted!
wat is the material i will buy it to see if i can reproduce the problem!
PS: I work on a Portuguese Farm with ± 300 A1 machines with the hack for TPUS and TPES and i print there softer materials from recreos and i never saw that !
I know your career in the printing world, for me you are a reference in this forum. I sincerely appreciate all the help you have given me during all this time.
I have been printing since 2018, and since then TPU is the material I print the most, it is true that in very high qualities and in very small pieces (layers of 0.08 and 1.0 almost everything), I had never experienced something like with the Bambulab. (I have had Prusa Mini, Prusa Mk3, Tronchy S5??, Ender S1 … and now 3 Bambu labs … I have only had this problem with the Bambu … but as I told you, I am close. I will share the solution here, but I already tell you that it will be in time per layer.
The material is any with A95 Shore. Lately I used Bambu A95HF and Sunlu A95
