OK, this is a “sagging” issue. The filament is falling, as there is nothing beneath it to support it. This is a result of a combination of cooling issues and overextrusion, creating too much material that has no support under it.
For PLA, you need to have active cooling.
You can also increase the cooling setting on your slicer software. That is, increase the pause between each layer, so each layer has more time to cool before the next layer is printed. This allows the print to have better support on it.
Also, print 4 marvins at the same time, or add it to another print you are doing. More printing time per layer = less sag.
Finally, it appears you are slightly over extruding. Measure your filament, make sure it is the set correctly. Extrude slightly less filament.
Ok, so I have the cooling running at full after layer 1.
I have run one at 500mm/min and can watch it sag as soon as it is laid down.
I am going to try 10 degrees lower on the extruder and see what happens.
I need to figure out the bridging area of S3D to see if I can get that setting to help on reducing the extrusion during that area.
ok, so this is mostly NOT a bridging issue. There is not much bridging going on there.
The bridge is when plastic is stretched from one area to another. In this case, this is a print area where a section is printed, and the extruder turns. Next layer, the section is printed further, and the extruder turns.
Fiddling with bridging is fine, and may help some.
Here is another suggestion: Support material. Click the support icon, choose .1mm, then automatically generate support. (you may have to add some manual supports. In your support settings, choose .2mm offset. this will create a wisp of support in that area, that will easily come off.
But again, this is a cooling issue. Print several at a time.
Try turning the bed heat off and set the extruder temp to 180. Also, make sure the fan is at 100% while printing.
Thanks for the info. I didn’t think it was really bridging but still learning!
I did print 2 at a time but go the same basic result. I have it pretty good for no support (thinking no support was a requirement for test). I have cooling maxed out and print as low as 500mm/min but back up to 1000mm/min seems to get the same result so sped up for time sake!
I’ll give your support suggestions a try to learn and see how it goes.
For now I did the following things to make it better:
- Lower the temp 5 degrees (no result)
- Increased the retraction with .5 MM
- Next to my nozzle fan I added a desktop fan to bring more cooling (cleaner model, but still a brow on the left eye)
- Calibrated my layer width (no result)
- Slowed the printer from 3600 to 2800 (no result)
For now I am going to print 4 of them in 1 print and see if that makes it better. Though, I cannot imagine that it should be that you have to print more models to get a clean one… Somewhere, something is going wrong, but I have no clue what… I hope that anyone has some extra tips and tricks.
Did you try turning off the bed heat and setting the extruder heat to 180?
