Stringy Infill
What might be causing this stringy infill? I read a post that recommended slowing infill speed down but I'm at 80 right now which is totally reasonable. First layer, perimeters, and top fill all look great. Filament is Prusament PLA and printer is an i3 MK3. Print profile export attached.
When printing a 0.2mm 40x40 first-layer calibration square it looked perfect and measured exactly 0.2mm thick but the solid infill wasn't fusing well with the perimeter, it separated when pulling the square off of the build plate. Also, the individual infill lines were separating and pulling up as separate strands. Extrusion factor and extrusion multiplier calibration tests were both spot on. This filament has been sitting in a bag for 8 months so I'm wondering if it's a material degradation issue, although there's no popping noises or steam coming from the extruded filament. My PETG filaments of about the same age print like a dream but use different profiles than this PLA, and the PETG profile isn't drastically different other than temperatures.
RE: Stringy Infill
Can you try to point out what exactly your problem is? Maybe with an Arrow in the picture? Your infill looks fine to me.
RE: Stringy Infill
These gaps circled in red. Shouldn't the infill be a solid wall, just like the perimeters?
RE: Stringy Infill
What infill are you using. That looks like rectilinear which looks like that as they are alternate directions in each. If you change to grid the layers will be stacked and touching, or cubic or gyro is etc.
RE: Stringy Infill
Oh wow. I had no idea rectilinear behaved this way. At one point I wondered what the difference between grid and rectilinear was but never investigated it. Thanks so much for helping troubleshoot this. I'm printing mostly structural parts so this is a crucial setting to get right.
RE: Stringy Infill
Rectilinear infill requires adding material to fully fill the support pattern. The default infill is set to 0.45 mm, I use 0.65 extrusion width to push out a bit more plastic and I generally get a good full layer with rectilinear. With the 200 mm/s speed profiles, 0.65 is sometimes not quite enough, and as much as 0.85 is needed on large parts where the nozzle actually reaches full speed. And I prefer it to grid infill for several reasons.
RE: Stringy Infill
Why do you prefer it over grid? Seems like they're the same thing other than rectilinear laying down intermittent layers.
RE: Stringy Infill
Rectilinear is much faster, and doesn't incur the thump-thump of the extruder bumping over a spot it has already laid down filament. I've worn out nozzles with grid infill. This was an E3D-V6 Nickel on Copper ... lol.
RE: Stringy Infill
The first rectilinear infill layer will have an extra wide line if infill width is set to 0.65. Have you seen this cause issues with any prints?
RE: Stringy Infill
The first rectilinear infill layer will have an extra wide line if infill width is set to 0.65. Have you seen this cause issues with any prints?
Never
Just finished this an hour ago:
RE: Stringy Infill
Why do you prefer it over grid? Seems like they're the same thing other than rectilinear laying down intermittent layers.
I prefer rectilinear mainly to avoid build up of material on the nozzle due to crossing pathes. I use a lot some filaments that build up very easily on the nozzle. there are other non crossing infills that i may use but rarely.