this post was submitted on 22 Nov 2024
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27
Shitty first layer on "big" parts, need some help [SOLVED] (lemmy.dbzer0.com)
submitted 12 hours ago* (last edited 1 hour ago) by ExcessShiv@lemmy.dbzer0.com to c/3dprinting@lemmy.world
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I have a cheap bedslinger, an Anycubic Kobra 2, and generally it's a pretty decent printer at the price. I have flashed klipper FW on it, so I'm not using Anycubics FW.

I have issues whenever I try printing bigger parts, the first layer is always complete shit (see post photo).

Heightmap, measured with inductive probe heightmap range is only 0.085mm from min to max, so it should be reasonably flat. The heightmap is automatically recalibrated and loaded as part of my print_begin macro.

Slicer settings for line width slicer settings for layer widths

I don't know if my printer just doesn't correct Z-height during first layer, if my line width settings are completely messed up or what is causing this, but the issue is only apparent on bigger parts with large contract surface on the bed.

[SOLVED] It was just Z-offset that was too low causing this. however when running the calibration routine from ellis3dp on first layer squish, the settings that looked good on the small calibration patches, looked like crap on bigger prints. I needed a bit higher Z-offset, but that solved it.

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[–] Mellow12@lemmy.world 3 points 7 hours ago

First layer too close as everyone has said, but I’ve also seen that effect when the flow rate is too high.

[–] huskypenguin@sh.itjust.works 14 points 11 hours ago (1 children)

Looks like textbook too close to the bed. What firmware are you running, are you able to baby step while printing? Also what filament are you printing?

[–] ExcessShiv@lemmy.dbzer0.com 3 points 11 hours ago (2 children)

As mentioned in the OP, I'm running klipper. Yes I can microstep it, but I haven't been able to find a sweetspot where it all looks acceptable.

[–] IMALlama@lemmy.world 4 points 8 hours ago

The good news is that you're running Klipper, so you can tune this very easily.

Go download a first layer patch from Ellis and use his guide as a reference.

The idea is to place 10 or so on the bed and adjust your z-offset on the fly until you get it right. Once you've found the correct amount update your printer.cfg.

[–] huskypenguin@sh.itjust.works 2 points 8 hours ago

PLA wants a small amount of squish. If you run your finger over the surface it should feel smooth. If you feel the ridges you're too low. And if it is wavy you're super low.

[–] PiJiNWiNg@sh.itjust.works 4 points 8 hours ago

As others have said, almost certainly nozzle too close to bed. Check your printer for a Z offset setting and click it up .1 or so.

[–] beeng@discuss.tchncs.de 4 points 9 hours ago (1 children)

Is 120% Normal for first layer?

[–] ExcessShiv@lemmy.dbzer0.com 1 points 1 hour ago

It's 0.48mm width with my 0.4mm nozzle, I think that's a pretty reasonable line width for first layer? Could be wrong though

[–] jjagaimo@lemmy.ca 3 points 9 hours ago* (last edited 9 hours ago)

Loos to me like overextrusion on the first layer. Mayhaps lower that first layer line width and check z offset. Also check esteps and extrusion multiplier.

[–] Cyv_@lemmy.blahaj.zone 4 points 11 hours ago

My first guess would be your first layer is too low, just cuz the wrinkles usually imply too much material so it has to wrinkle up to make room.

[–] roofuskit@lemmy.world 1 points 10 hours ago (1 children)

Are you letting your bed soak (sit heated up) before probing? Beds warp as they heat and if you start probing immediately after it comes to temp the shape of the bed will likely change as it settles.

[–] ExcessShiv@lemmy.dbzer0.com 1 points 10 hours ago (1 children)

I haven't noticed any difference in this even when soaking for +45min

[–] roofuskit@lemmy.world 4 points 9 hours ago

Then it has to either be z offset or over extrusion. Both are easily calibrated.

[–] ShellMonkey@lemmy.socdojo.com 1 points 11 hours ago (1 children)

Is there a lot of crackling from the nozzle? It's heard of some filament absorbing trace bits of water that can cause gaps and bubbles like that.

[–] ExcessShiv@lemmy.dbzer0.com 3 points 11 hours ago* (last edited 11 hours ago) (1 children)

No it's completely dry filament, I store it in dry boxes with silica, and always print straight from the dryer. There are also no other issues that is related to moisture in filament, it prints well except for the very first layer, and first layer is only an issue on large models. It's not limited to this specific filament.

This particular print is also printing well, as soon as it's beyond the first layer.

[–] IMALlama@lemmy.world 4 points 8 hours ago (1 children)

This adds even more credence to the idea of your nozzle being too close to your bed for your first layer.

[–] ExcessShiv@lemmy.dbzer0.com 2 points 1 hour ago

Yeah it was just too close, but it was only really an issue on the larger prints (I don't make that many of those). The offset that looks fine on the smaller calibration patches looks like shit on the bigger prints.

I was able to find a good setting eventually though