Hum… The Lidar does not do any bed levelling, it only make a check/scan to verify if there is no part left onto the bed.
I would say that your big PETG part maybe shrink when cooling and as PETG usually stick very well it warp the upper surface of the bed, or unstick the magnetic plate ?
“Hello,
We fully understand your concern, but the measured bed leveling data across the board shows us that the heatbed is within the accepted standard and the bed leveling can easily compensate the small deviation.
Replacing the heatbed or the printer will not provide a better result, and a replacement printer will also not have a flatter heatbed.
The only solution we can offer is to return the printer for a refund. Please re-package the printer with all the accessories as shown in this video and prepare it for shipping.”
This was end of Jan, the situation rubbed me the wrong way especially since they couldn’t tell me what the standard was or share my data with me, however, the return support was great!
I was nervous after hearing a few Bambu support nightmare stories haha, but they do seem to be putting more and more effort into improving that.
The return process was relatively painless for both machines (one of which was outside of the return window) as well as the $800 worth of spares/replacements I had purchased (also out of the return window)
@Quality3d do you have thoses bed levelling datas ?
EDIT: ho sorry… they have and you dont have, well not fair
Yeah it was weird as well because they didn’t ask me to run the bed level/tramming procedure & didn’t ask to submit any data to them like they seem to do with others dealing with the same issues.
They saw my photos, claimed r&d said mesh data looked good & offered a refund.
I hadn’t printed with either machine for a day or two before submitting the ticket(s) so I thought they’d want that but 
That’s pretty great, given the circumstances,
Is it bad? I was looking at one before I found out about the X1C, but I couldn’t justify the cost. I couldn’t reconcile the price and figure out how to get a good ROI on produced parts because a single printer was so much. Buying multiple printers would have meant a boat load of printed parts before I broke even.
I kinda assumed it is more for companies who are doing prototyping or things of that nature.
The fully decked out S5 with the filament changer sure does look badass. 
Same. I’d preorder one today if I could. 3D printing has come so far, so fast compared to when I first started (with a much lower cost). I can’t even imagine some of the cool stuff that would be in say, a $4k X2C Pro in 6-12 months. And I have no doubt the X1Cs will still have a place.
I feel like Prusa was pretty smart in their modular bed design on the XL.
Were the probe on the CR10? Unless it’s the nozzle as with the X1 I’d imagine the coverage is similar?
It’s to be seen if all the tiles are level. Also the only heating zones May introduce new issues. I have a 5 head on order so watching with interest
We could easily make our own bed leveling data. You only need to strap depth gauge probe where the nozzle usually is and run it across the bed.
Of course, but just from a pure hypothetical standpoint, the math on less warp checks out.
The amount of linear expansion is directly related to the length of the original piece and the change in temperature. Smaller pieces will expand less than larger ones of the same material at the same elevated temperature.
Smaller pieces are also cheaper/easier to manufacture with precision as well.
How those smaller pieces interact with each other at elevated temps remains to be seen. But in theory, it should work quite well.
I believe the lidar is also used in bed leveling - multiple articles describe a 2 stage ABL with the physical nozzle piezoelectric process as well as lidar. From Bambu’s wiki:
Bambu Micro Lidar brings micrometer-level precision into 3D printing. The system probes the nozzle height, calibrates the flow, and scans the first layer, so the possibilities are endless.
To be sure I just did a simple bed levelling using “Calibration” menu, no Lidar, you can see its light on the camera when it is on (blue light appear on camera view).
Try it.
Despite what Bambu said, it may help on measuring the nozzle height, but for sure not for the bed levelling probing process.
EDIT : that said using it to measure the nozzle height and not to probe the 36 points of bed levelling appear then IMHO useless, but a test with the Lidar scotched would answer this question.
I have indeed seen the lidar used during ABL. Not on every touch point, but a few - like it is used for a periodic sanity check…
Maybe best to wait they explain in detail how they perform the ABL.
EDIT :
What I cant understand is how the Lidar could be smart/precise to measure any absolute values without references, this would require it to be perfectly positioned, I mean with a micrometer precision. I think it can only be precise for relative measurments like the difference of fow in a line or the layout of first layer etc…
Hard to get them level though right? Each one mounted individually with a single sheet on top which is influenced by the bed below. I remain sceptical
ABL is just compensation. If the bed is warped then the part will follow that warp, it will just print successfully as the ABL will compensate and maintain a set gap
Sure it is what it is made for, the question raised was if the Lidar is involved in any way to the bed probing process or if everything is made with the “sensorless” measurments by the nozzle. I think that the Lidar is not involved in anything else than veify if a piece has been forgeten onto the bed (and PA and first layer check).
Yes. But that’s what auto bed level is for, since there is no such thing as perfectly flat when it comes to print beds, especially with such huge temperature fluctuations. Those minor variations of flatness on multiple small beds are much easier to predict and account for than one huge bed.
In theory…
Will be interesting to see how the small beds are mounted and heated, how the gaps are between them, how even the heat is, etc.
My CR-10S has a BL Touch probe on a custom hotend mount running to a Duet 32bit controller. It’s a 310x310x420 printer I’ve upgraded a lot of it.
Better steppers, new Z threaded rods so I can print any layer thickness sperate P/S for the bed only rest running 24V. It’s a CR-10S in name only.
Don’t get me started on the bed. It was way worse than my X1C and that’s .93 mm off!
It got flat. Violence, dead blow hammers, skill and a large doses of luck may or may not have been involved, I’m not saying. Getting a replacement from Creality? You must be joking. Has one small spot back center that’s not perfect but Auto Bed Level fixes that.
I actually was looking at mounts for mine at one point, but decided it was too much of a PITA.
In theory. I think we’re in agreement and it will be good to see how the Prusa solution performs
I wasn’t trying to call you out. I have a printer with a Duet and love it. The probe however is to own side of the nozzle so the area I can probe is limited on the side of the nozzle where the probe isn’t. So if I want to prove the whole bed I simply can’t. I lose 50mm or so from the probe to the edge of the bed on the one furthest from the probe. That’s my point, calling out the Bambu in that instance makes no sense. The ideal probe is the nozzle which the X1C uses
