3DPrinting

Note: the original thread title was "how do i fix overextrusion on infill in orcaslicer?". we've since deduced that's not what's happening. i'm leaving the rest of the op as is so you can follow the process.

So i'm doing a test print for a hot wheels track i'm making for a friend's kid on my snapmaker u1, and i'm hearing scraping noises. when i look at the in-progress print, i see this horribly mangled infill. obviously the nozzle is hitting the previous layer, right? so that's overextrusion, i think. too much material. but i let the print run, thinking maybe ironing will save it. but the surface finish is absolutely awful. all of the bumps and ridges of the infill pattern transfer up through the solid layers. not to mention now there's ringing from the nozzle hitting the bumps, so there's even more bumps. bummer.

also yes i fucked up the overhangs by trying to cheap out on supports. at least that one i know how to fix.

so, how do i deal with this? snapmaker ships a specialized version of orcaslicer (it's called snapmaker orca, it's on github) to deal with the u1s four separate print heads, and as far as i can tell there's no setting in there for infill flow? should i just try to slow everything down? i thought it might be vibration-related so i added a 20kg concrete slab and a thick anti-vibration rubber mat to the setup but nothing changed. i also dried the filament out for six hours. the hygrometer in the snapdryer got down to 12% i think.

i'd hate to not be able to print this for the kid, it's such a cool plaything.

Edit: to clarify, the grey filament is snapmaker matte PLA. the spool has an rfid chip in it so i've not changed any settings, the printer just detects it and sends it to orca.

Edit 2: i've done another test using gyroid infill and a lower flow rate, as recommended in the thread, but the surface finish is all bubbly. i cut a part out to check if the infill was the problem but it looks fine, while the surface is fucked. this is after ironing, by the way.

Edit 3: okay, i've now dried the spool out overnight and made a test disk with tweaked parameters, and i'm still seeing bubbles on top. here i increased the ironing flow from 8% to 20% so the surface is a lot smoother, but the bubbles are still visible. also getting some weird blobs on the side? could be related to the ironing. the middle circle is for a multicolor test but the dot was so small that the filament amount came out to 0.00 grams and the printer didn't really know what to do. it just put in a single dot of (the wrong) filament and avoided the area.

the changed parameters are

• flow ratio: 0.95 -> 1
• nozzle temp: 215C -> 220C
• max volumetric speed: 22mm^3^/s -> 15mm^3^/s
• seam position: nearest -> random
• scarf joint: off -> contour and hole
• ironing flow: 8% -> 20%
• infill: gyroid 15% -> TPMS-D 10%
• infill combination: off -> on, 80%