bedmesh not applying at all for first layer?
My company bought the idex vcore 4 500 to prototype large parts, but suddenly it does not want to use the mesh when doing first layers.
it probes before ach print but no matter if i do small or large prints that spann the entire bed. when i did a 400x400 1 layer test i had to turn flowrate down to 80%, it unmderextruded where my blue sides are on the bed and overextruded in the middle. were having huge problems with general bad extrusion as well..
Any insight would be extremely valueable. its all stock ratrig, using newest prusaslicer profiles for 0.6mm. The printed worked fine in the beginning but now almost all aspects of quality seem to degrade.
14 Replies
aditional image for clarity
did you ever get it figured out?
@Hellspark Are you using adaptive bed meshing? If yes, have you inspected the mesh that it creates while printing? I see that you attached the bedmesh named
default, but if you are using adaptive meshing, that is not used and has no real relevance (as I understand things). Adaptive bed mesh is turnedon by default, so you will have had to turn it off explicitly is you are not using it. I recently made a post detailing my issue with adaptive bed mesh, where I have a perfect mesh when I make it / calibrate it myself, but the adaptive bed mesh that is created at print start will have a signficant offset that is applied. I have encountered it when the offset is in both directions. Sometimes it's very low, so the first layer is totally squished and sometimes it's very high, so the first layer appears incredibly underextruded (and looks similar to your picture). I have gone through the relevant python scripts and I can get around the issue, but IM not exactly sure why it's occurring.
I'd also note / add that my experience was similar to yours. It was all working perfectly fine then one day it stopped and had tons of first layer issues. it ended up being the adpative bed mesh issue.i will have to look again, but remember it used the proper adaptive mesh
Im saying using adaptive mesh is broken for me. I can only get successful prints when I disable it and my issues were somewhat similar to yours. Adaptive mesh disregards your mesh,
default, without intervention
So in your case, unless you have intervened, that mesh default is never used and is not really relevant, other than being used to ensure your system is properly squared, gantry aligned and level. In the context of your prints, it's not used and meaningless.one way to see if this is happening is to kick off a print, and then checkout the mesh
ratos. That is the default name it will use for the adaptive mesh. Here is an example of the mesh I would make, which is perfect and then the adaptive mesh created from a print start. You can easily see the extreme offset that is being appplied. It produced the exact kind of first layer you were mentioning for me.
interesting .. it might be the case for me as well. I get perfect print on all corners but sometimes its squished when i print small parts with adaptive mesh enabled. I have to check this on myside well
Hello I heard about adaptive mesh the first time here what is this ?š
Adaptive Meshing (BETA) | RatOS
RatOS comes with it's own adaptive meshing (functionality was previously handled by PAM by Helge Keck), similar to KAMP. When enabled and configured in your slicer, RatOS will only probe the print area and your configured probe location, potentially saving a lot of time on smaller prints on bigger printers. RatOS will keep the resolution of your...
Ahhh this one thank you
There definitely seems like an issue could exist. I can get marginally better results with this setting,
variable_beacon_contact_start_print_true_zero: False, but it still is not correct, just less bad. I have also taken care to ensure the mesh that I create myself is in a properly pre-heated environment, exactly what my print settings are, so it's not a function of making a mesh while the bed is cold and chamber is not preheated being the difference in the adaptive mesh. What the cause is, I have no idea though. For now I have just created a few different meshes, specific to temperature conditions and the exact bed sheet Im using and I just ensure that I've added the following settings:
to my printer.cfg. Though of course if I was using a smooth bed sheet I'd set that one. it's a bit of a pain in the ass because a change to those settings requires a printer restart. I would expect that it could be made to be dynamic, with slicer settings to set the proper value for variable_bed_mesh_profile at runtime, but this is the first printer I've ever used running Klipper so Im not a macro expert yet.
Definitely could be. The offset I can get it sometimes extreme in the positive direction or the negative direction. So for a while, my first layer was getting totally squished in some places and at other times, it appears extremely under extruded and doesn't stick. It's actually been happening to em for a very long time, but I was not aware of it until recently. Or at least, this problem has been happening to me for a while, and while I can't go back in time and verify, it seems to be this is the reason.Any news on this? Did this adaptive mesh was the issue? I am asking because lately I am not able to print anything large on my printerā¦ usually one corner has best first layer other corner nozzle is nearly scratching the PEI and on the back the print doesnāt stickā¦ and usually nozzle grabs and removes the print from the bed
The main thing that fixed it for me was to heat soak the nozzle for 10min .. If you notice that your print starts perfect then in the middle it start to come closer to the bed then this is likely the cause as the nozzle continue to expand during printing
it varies from one nozzle to another so you have to find the best time
I would like to add to this post, as I have the same problem. I did a test print at 200 x 200, with a total printing time of 20 minutes. At the beginning, the layer was perfect, but after 10 minutes, the nozzle came closer and closer to the bed, so that you could see wavy patterns from the squish. The bed was cold because I wanted to see if it's a heatsoaking issue. I will try this evening with a longer heatsoaking time for the nozzle. Right now it is 2min