Glitch in the Matrix? (How did this happen?)
Trying to figure out what could have possibly caused this? It's like the machine lost its position and shifted over for the rest of the print. No interruption to electrical power that I'm aware of. Bad upload of the G-code maybe? All the previews looked fine.
RE: Glitch in the Matrix? (How did this happen?)
For the quickest solution, please zip your 3mf project file and upload it here.
I had this happening when selecting "avoid crossing perimeters" without stealth mode.
There's a bug, that either doesn't slow down the print head before sharp turns or overloads the processor due to that setting causing lots of tiny movements.
Even in the slower, structural profiles, the travel movements are at 350 mm/s, which is simply too fast for that setting.
RE: Glitch in the Matrix? (How did this happen?)
Thanks for the feedback! Since the design is proprietary, is there another way for me to provide diagnostics? I re-sliced and redid the print, and it happened again.
RE: Glitch in the Matrix? (How did this happen?)
Mhh, different height, so not really repetitive.
Regarding the upload: simply "save as..", give it a clear name for us, delete the model and save it.
I don't need the exact STL, since it doesn't happen in the exact same spot. I can just throw a similar stl in the project and try to spot the issue 🙂
RE: Glitch in the Matrix? (How did this happen?)
Let's see if this works. Thanks!
RE: Glitch in the Matrix? (How did this happen?)
Not sure the attachment is coming through
RE: Glitch in the Matrix? (How did this happen?)
Not sure the attachment is coming through
Doesn't look good, I don't see any attachment. How did you do it?
I always use the "Attach file: " button in the bottom left of the posting window. You'll see the file name right next to the button after uploading it.
I attached a zip, so you can see how a post should look like.
RE: Glitch in the Matrix? (How did this happen?)
Maybe it has to be a .zip file? I attached the .3MF file. Will try Zip
RE: Glitch in the Matrix? (How did this happen?)
Yep, needs to be a .zip file!
I had a look and I'm not sure what's causing it, but due to the kinda "thin" geometries and the organic supports, the nozzle might hit the object during travel moves. With the 0.6 mm nozzle and PETG-CF, the nozzle probably can't just move through the collisions and at some point causes a layer shift.
A few things I would try, in this order or just everything at once:
- Use Stealth Mode, which limits ALL movements to 160 mm/s, so the nozzle won't smash into the object at 350 mm/s.
- Settings -> Filaments -> Filament Overrides -> Activate "Steeper ramp before obstacles" and activate it with the second checkbox right next to it. (Left box is "activate the override", right box is "activate the actual setting).
- Print Settings -> Speed -> Travel -> Set to just 110, which is the speed of the Solid Infill in the structural preset.
- It also might be some warping, which lifts some edges, that are then hit by the nozzle. I'd recommend to slow down the 1st layer quite a lot for a test. In your project, it's set to 45/70 mm/s. I'd suggest setting both to just 15 mm/s.
Maybe it has to be a .zip file? I attached the .3MF file. Will try Zip
RE: Glitch in the Matrix? (How did this happen?)
Perfect, I'll try these tweaks and report back. Thank you!
RE: Glitch in the Matrix? (How did this happen?)
I don't seem to see those settings for filament. Perhaps change the "ramping slope angle" to something steeper?
Was the part originally designed for machining from metal? Rising unconstrained curves are always tricky, they have a tendency to warp as the filament cools and if the part twists enough there can be a head-crash causing layer shifting like this.
I would use cubic infill, reserve the honeycomb for occasions when the very slight stiffness bias of cubic really matters.
Snug support might also hold the part in place a little better.
If at all possible the best way is to include a breakaway stabilising fin on each arm:
It can taper to a single extrusion width at the contact point. The idea is to hold the arms in place until complete and then remove post printing.
Cheerio,
RE: Glitch in the Matrix? (How did this happen?)
I don't seem to see those settings for filament. Perhaps change the "ramping slope angle" to something steeper?
I think you need to set the Slicer to "expert mode", in the top right corner of the main window. Forgot about that, sorry.
Making the slope angle steeper can help, but might not, if the collision happens early in the travel move.
Lift before obstacles moves the nozzle vertically before starting to travel, if there's an edge close to the nozzle.
It can leave little marks on the object, since it's not "wiping" while lifting, but I didn't have issues with it yet.
RE: Glitch in the Matrix? (How did this happen?)
I had this happen recently on a PETG print because the nozzle was collecting gunk which eventually stuck to the print. Don't yet have a solution (but haven't been chasing it either, other priorities and haven't been printing). PLA is fine.
RE: Glitch in the Matrix? (How did this happen?)
I had this happen recently on a PETG print because the nozzle was collecting gunk which eventually stuck to the print. Don't yet have a solution (but haven't been chasing it either, other priorities and haven't been printing). PLA is fine.
Difficult issue, if the extrusion multiplier is fine for the filament. My second try would be to reduce the extrusion widths, so the filament stays a bit more "under the nozzle".
However, the blob on the nozzle should stay soft enough to just cause ugly prints, not a layer shift. Only if it comes loose, forming an obstacle for the nozzle somewhere on the print object.
RE: Glitch in the Matrix? (How did this happen?)
Can confirm it came loose and stuck to the print on one (I was watching because it was a reprint - initial failure I'm less sure). I've tried extrusion multiplier and it helps, but on a recent print I see the top layers aren't quite touching each-other - may be a different issue though for that (I needed a few slightly narrower filament clips so just x-scaled down). Quite likely my issue is just learning curve and unrelated to the one OP shared, but figured just in case...
Difficult issue, if the extrusion multiplier is fine for the filament. My second try would be to reduce the extrusion widths, so the filament stays a bit more "under the nozzle".
However, the blob on the nozzle should stay soft enough to just cause ugly prints, not a layer shift. Only if it comes loose, forming an obstacle for the nozzle somewhere on the print object.
RE: Glitch in the Matrix? (How did this happen?)
Ok, here were the settings I changed:
Set the machine on Stealth Mode. Here is the result:
So, slowing things down a bit definitely helped. Upon closer inspection, you can still see some areas where it was struggling to hold the layer. I do believe it has something to do with this particular material (PETG-CF), since I haven't had any issues in PLA or regular PETG. It seems the material "swells" a bit after cooling, so maybe some of it's from that. With dryers I'm getting the spools down to 18-23% humidity, so not sure how much that contributes.
Thanks everyone for your feedback. I'll keep experimenting and see what else can be done to improve this material's printing quality.
RE: Glitch in the Matrix? (How did this happen?)
It is. I agree it could be optimized for additive. Appreciate your tips on the supports. I'll see what I can try.
Was the part originally designed for machining from metal? Rising unconstrained curves are always tricky, they have a tendency to warp as the filament cools and if the part twists enough there can be a head-crash causing layer shifting like this.
I would use cubic infill, reserve the honeycomb for occasions when the very slight stiffness bias of cubic really matters.
Snug support might also hold the part in place a little better.
If at all possible the best way is to include a breakaway stabilising fin on each arm:
It can taper to a single extrusion width at the contact point. The idea is to hold the arms in place until complete and then remove post printing.
Cheerio,
With dryers I'm getting the spools down to 18-23% humidity,
Borderline, check your dryer, you should be aiming for 10% or 15% at most.
Cheerio,
RE: Glitch in the Matrix? (How did this happen?)
Ok, this is good feedback. I can't seem to get it lower with these PolyMaker dryers, even with the airflow improvement pieces off Printables. I've seen others here recommend food dehydrators. Is there one that everyone recommends?