How would you do that?..
1 Like
I haven’t touched it yet, but belt tension has an influence on skew. So adjusting belt tension can help.
And I think, I have seen some guides on YouTube how to adjust squareness if belts are correct.
The general method is to slack the belts, hold the gantry square and then re-tension them.
One guy is making acrylic tools to help hold everything square (for X1C). I have one and it’s helpful:
4 Likes
Is it even possible on bambu core xys? I thought all you can do is to adjust the belts to make them relatively balanced (on tension)?
Definitely.
While the belts are loose, it’s very easy to skew the gantry. Tightening the belts does not force it into alignment.
1 Like
I believe the Bambu CEO mentioned that this wouldn’t make any difference for PLA, as it was designed and intended for use with technical filaments. Would you be able to run your test using ABS-GF? I’m very interested in the accuracy when printing with glass-filled filaments.
@Sebo3D Not sure who your question was directed at, but if me, I don’t presently own any ABS-GF. But I rather doubt it would make any difference. First, the genius of the two-pin measuring method is that even if there’s overextrusion or underextrusion, the two-pin measurement method will cancel it out. Second, the vision encoder is about accuracy of nozzle placement, so in that respect it doesn’t matter what filament you’re extruding.
Put differently: if you were to print a calibration cube and measure that instead, there will be noise in the measurements relating to your flow rate and possibly your flow dynamics as well. However, knowing that, it seems to me you could use a calibration cube as yet another way to dial-in those flow factors more precisely through some kind of iterative process of printing, measuring, adjusting, printing again, measuring again, adjusting again, and so on. That way you’d ultimately get accurate builds with solid objects that contain no voids, provided you also set the shrinkage compensation correctly.
That’s three variables that you’d have to juggle simultaneously. Without a system, it’s not likely to go well from just purely a FAFO approach.
Just my opinion. I’d be curious what others have to say on that topic. I’m not a metrologist, but possibly some people here might be.
That said, I am getting some improvement with just a FAFO approach for dialing in a perfect first layer, since the Bambu provided H2D calibration tools are incomplete, IMHO, in ways I’ve posted about on other threads so no need to repeat it all here.
1 Like
Thank you for you anserw, here is video I watched about encoder plate:
56:32 quite interesting
This is not a filament specific change. Maybe he meant to say that it would be harder to resolve the difference in filaments with higher shrinkage rates. The difference is at the motion system level.
@Sebo3D He’s saying the same thing. He says the vision encoder plate improve the accuracy of the “motion system”. I simplify that to say that the center of the nozzle opening is more accurately placed, because that’s the most important result, as far as I can think of. If nothing else, it will be more repeatably placed in the same spot every time you command the motion system to go to a particular (x,y) location.
He also says that you’ll have less shrinkage if you use fiber infused filament. Well, no doubt, but you’re still going to have some, so I don’t see that doing that would free you from having to run a shrinkage calibration anyway. In that case, does adding the fiber matter? Well, it would help prevent warping, if that’s a problem that you’re having. Otherwise, I don’t see how it would help, because shrinkage compensation seems to work pretty well (at least on the test model). Maybe he is trying to say it works less well on more complicated models. I don’t know, as I have no data on that. Other than cost, nozzle wear, and an increased risk of jamming, I don’t see any additional downside to using fiber infused filament. Perhaps others here with more experience than me can comment or add more color to the thread discussion.
1 Like