OH, not at all!! I didn’t feel that in the least. Ah the problems of text without facial and body language … LOL! Emojis only do so much, and some hate them.
Duet allows the defined probe area to be a negative value IIRR, don’t recall how I defined it but My X home is 40 or so mm off the bed and I have it probing 1st point starting at 10 (15?)mm.
I do run a bit short of bed edge on the far right, but it’s maybe 30-40mm. Haven’t looked in quite a while (if it ain’t broke, LOL)
But you’re right - BL’s nozzle probe is ideal, sure wish they’d let us play with the Mesh.
My early March order, originally scheduled for end of March delivery just got updated with a tracking number. Pls everyone pray to whatever you believe in for me for an ultra flat bed with no bubbles that stays flat when heated . I will post again when I receive the printer.
They literally advertise it as Dual-ABL (Dual Auto Bed Leveling). The feature of course does not exist on P1P.
I already said I suspected it first but it was not it. I wasted a lot of time on troubleshooting, including fixing edges of the build plate to the bed by Kapton tape just to get exactly the same results. Bed is visibly warped when it’s hot which I also verified by steel ruler.
It first calibrates multiple points of the bed by piezoelectric sensors in the bed. So LIDAR can measure those points and use them as reference. Of course I’m not sure about exact algorithm but lidar drives over all of the area where 1st layer will be present. And 1st layer is perfect even on sides which are warped the most.
This is a basic bilinear bed levelling, bed levelling use a grid and interpolate between probe points or extrapolate when not inside the probed area (for border). The Lidar check for object on plate, you can disable it on “Print Option” .
Problems can occur for extrapolation (borders) as it is more incertain than interpolation
EDIT: if you have any sources about Lidar and how it help levelling (I mean real sources, not random blog or video), I would sincerly be interrested in, as it is pretty hard to find good informations and I only rely on tests I can do and my knowledge in the domain of FDM 3d printing
It’s not. And outmost points where mechanical sensing is done is before area where most of the warp happens. Bed is more or less flat, It’s about outer 3cm where the most of warping happens. Mechanical sensing cannot compensate for that as it does not check so close the the bed perimeter.
On other printers, when a external sensor is used like capacitive, inductive or even phisic like BLTouch or 3DTouch you often cant measure at the borders, so you rely on extrapolation, wich is not that good as interpolation.
Bed leveling can only compensate for layers being properly laid out. Which it does just fine. It cannot compensate for warped prints and they will be as warped as the bed is, which in my case is about 1.5mm difference between center and edges. You physically cannot print on warped surface and get straight bottom of the print.
Thanks, this is short but this is a source… they simply say they cross-check, meaning both would be necessary, we already know it can work without the Lidar, I am 100% sure it cant work without forcesensor/sensorless drivers.
I still dont believe it help significantly in the levelling process, at least I cant see yet how it could help, I think it is probably more a commercial advertisment, I may try to do some tests but would be better if Bambulab exlains how it is used in detail.
Don’t fool you, I am always happy to be proved wrong, that’s why I am answering to you rather than ignoring you, this Lidar makes me curious from the very beginning.
The only thing I can imagine it can help would be “seeing” a bubble or a defect between probe points.
EDIT : to be a bit more clear, probe points are few centimeters appart, with a simple bilinear algorithm the error should be really really small, non significative.
EDIT2: and to be even more clear : while printing at 100mm/s I am not sure the printer can compensate more precisly than what the printer get with its standard bed levelling probes points.
This would requiere a bit of computation and research, but the bed probably cannot move fastly with a such high precision, but that’s only assumptions ^^
Well, I performed a test with a tape masking the Lidar and a test without tape, printing a only one layer object on the border.
Spoiler alert : results show no difference, I have recorded both tests but it is a pretty long video, I will shorten it and share. I will also redo a second time the same tests to be 100% sure.
Ugh. Replacement bed showed up for me today, another v2 (what I currently have), and out of the box it’s worse than my current bed, with a 0.40mm dip before it’s ever been heated.
I reached back out to support, really hoping they let me return it and move to v3 since I don’t mind replacing the power board.
So frustrating to wait a few weeks for a bed, just to get one worse… and to add insult to injury I tore my printer down ahead of time, assuming the new bed would be better. Live and learn I guess.
Okay guys, replacement bed (for my replacement bed) showed up today and… you decide my fate with Bambu
Seriously, I ask in complete humility and an open mind here, what should I do? (My use case is large functional prints which don’t need to be perfect but then again can’t do with 0.5mm banana-ing either)
Pictures are on an uninstalled bed, both with the PEI plate on and off. Tried three different rulers. Solid walnut table.
. I will post again when I receive the printer.
