I have noticed that when I create print jobs that use the far left corner and to a lesser extent the near right corner of the build plate, the print quality is bad and eventually causes the print to fail.
The first inch or so of the print works fine, but once it gets to a certain height, the filament doesn’t seem to lay down flat. It kind of curls up and the print head keeps dragging over it until eventually it just fails. Either because it snags the front face of the head or I just cancel it.
I have printed jobs that avoid the two problem corners and the print turns out great.
I have tried doing a flow calibration and it didn’t change anything.
I have tried two different filament types (Overture PETG and Spool 3D ABS) and both have the same issue.
I have ordered some Bambu filament (mostly because I needed some) to see if anything changes.
I am using the stock Generic ABS and Generic PETG slicer settings.
I found this post and wondered if it was the same thing:
If this starts from the very first layer, an uneven layer then it is likely a build-plate in need of a decent clean.
Warm to hot water, dish soap (cheap stuff no extras).
Soap the build-plate and rub thoroughly across both sides, holding onto the edges only when manoeuvring. Ideally, lay it onto a clean towel (lint free) during the cleaning process.
Rinse completely, dry totally.
Put back in the printer using your finger tips on the edges.
If this happens after a decent first and second layer you may need to dry your filaments.
Thanks for the reply. First inch worth of layers look great. The PETG filament had been in my dryer for a few days. The ABS spool was fresh out of the sealed bag, so I hadn’t dried it.
Well, those are the most likely places for warp/curl to start. Large surface area on the bed can have that issue. So, I want to say it’s curling up on those edges raising the model z and causing the drag.
The pics aren’t the greatest, it almost looks the opposite of that to me, like the z of the nozzle is too high, but perhaps its just the over-extrusion of it all.
Oh ■■■■, I see it now in the second picture. The part is barely curled off the plate, but the plate is WAY curled off the bed! So you need a hotter chamber / bed or possibly to tune the slicing / infill / orientation to limit the warp
@Lenyo nailed it - whatever is causing it, your model is lifting at the corners in question. That’s messing up the spacing between the nozzle and the model and causing those defects.
The model print settings can be a factor. If walls are really thick the temperature changes and shrinkage as it prints can curl a model right up. That’s where extruder and bed temps and probably a number of other settings can come into play.
This is the ABS print. The plate stuck really well to the model and the print failed (because the front head part detached) in the middle of the night. When the model cooled, it pulled the plate up. What I’m saying is that the problem occured before the plate curled up. When I printed the PETG there was no such warping.
I can totally see this happening since ABS is notorious for this. I supposed the same could be happening on the PETG. It wouldn’t take much to cause a “drag” over the layer. It also makes sense as the bottom layer is fine, but when it gets higher it has the problem…longer print time and more material to shrink causing the unexpected Z height.
I will try and address chamber temp and try and reduce part warp and report back.
