I bought a vision encoder for my H2S. I ran the calibration and afterwards I ran a job I run all the time and it had a very bad layer shift that caused the print to fail. Not just a single layer either, the prints looked like the layers were all slowly drifting to the right. I thought it was a fluke so I ran it again, same thing. I did a factory reset and ran the job again and it was fine. Then as a test I ran the vision encoder calibration again and reran the same job. It had the issue again.
The job in question is a plate full of objects that touch all the edges of the printable area. My guess is the vision encoder calibration is causing it to overshoot one of the edges just a little, which causes it to hit a hard stop and skip a step. It does that every layer so that it’s a little off on each layer until it eventually fails.
Has anyone else had this issue or heard of this issue before? I don’t know if I got a bad plate, if there is something mechanically wrong with my printer or if there is something wrong with the camera that’s causing the vision encoder calibration to be off.
This seems plausible, are the printable boundaries really that close to a physical end stop? Maybe you are hitting a software end stop instead. Can you push your models a few mm back from the edges?
I’ve seen some crazy looking error calibration results other people have posted after calibrating the H2S, what does yours look like?
More generally I’m wondering if this affects (for better or worse) other positioning, like the head going to the cleaning station or on the H2C the docking rack.
You only get that little dot pattern, but mine looks skewed. Like the dots at the top are shifted right, the ones in the middle are roughly aligned and the ones at the bottom are shifted left.
That also makes me suspicious of the alignment of my bed. The vision encoder does rely on the plate being perfectly aligned. If the bed isn’t perfectly square then the vision encoder would be rotated slightly.
I can’t really move away from the edges because 8 of these fills the bed. The whole reason I got the H2S is because it can hold 8 vs my A1 which could only hold 6. It’s a multi color part, so more per bed means less waste per model.
hello @Dan203 !
i have the exact same issues than you ! looks like 3-4 last layer are shift outside. It looks like a seam. did you try to print without the vision encoder ? do you redo a simple calibration and print again the same model ?
It put me back where I started and got of the layer shift, but I paid $80 for the vision encoder plate so I could fix another issue so that issue is back
Definitely the vision encoder. I did the vision encoder and started having the issue. I did a factory reset and it went away. Did the vision encoder again and the issue came back.
I’m wondering if they even tested this fully with the H2S? The H2D and H2C both have dead zones so they can’t print all the way to the edge. The H2S is the only one that can actually print edge to edge in the H2 family.
When I got my H2S there was another issue printing at the front edges because the PTFE tube was too short. Something they clearly hadn’t considered because the H2D couldn’t print there. This might be a similar situation.
Figure it’s at least worth asking, but did you remove the protective film from the vision encoder plate before running the calibration? The film is so perfectly cut that you really can’t tell that there’s actually anything covering it. I kept picking at the edge worrying I might be ruining this stupid expensive plate until I got an edge up and sighed with relief once I found it really was a protective film.
Yeah there really is. I wouldn’t have known if I didn’t see the warning on their product page.
It’s edge to edge, so just pick a safe corner and start picking at it and it’ll start coming off. They really need to put a warning sticker on the top of the film so you know it’s there.
This seems like quite a serious skew correction, my guess is a deviation of roughly 0.7mm judging relatively to mine. My H2D reported before the firmware update a maximum of around 0.35mm. Yours looks approximately double to mine.
It really looks like a skew because the vertical deviation is quite balanced.
But still, the image is scaled, so it’s an estimated guess.
So either they really did a bad job tramming the the X-rail, or your package had a serious drop during transport.
I would definitely open a ticket at Bambu.
Somehow your printer doesn’t have the full width due to the large skew.
I think the Vision encoder does a good job, but the physical X-travel on your printer is not enough to accommodate this amount of skew correction and still have the full 350 width left.
