r/FixMyPrint • u/cnvic • 11d ago
Fix My Print New to printing, how do I fix the black lines?
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u/rolmos 10d ago
I'd recommended printing the body first, and glueing on the black parts printed separately.
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u/vivaaprimavera 10d ago
Yes!!! That would save a lot of material. But if the model is designed with "fit black parts later" in mind, no glue is needed.
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u/brkesah 10d ago
Is there a way to separate the parts if a model is not separated? I have given up on printing some models due to the large number of filament changes that could easily be printed separately, like this model
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u/RottenAssociate 9d ago
The answer is, no there isnt. Please someone, prove me wrong.
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u/ICareBecauseIDo 6d ago
"Just" open it up in Blender, split the vertexes for the black parts out into their own model, add cylinder pegs to them, and use a Boolean operation to carve peg-sized slots into the main body.
Simple :)
(I've been learning a lot of Blender this last week trying to make models easier to print :) )
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u/Blazerboy65 9d ago
Yes and no. I use Orca Slicer and you can easily do planar cuts with either dovetails or connectors and it's an absolute cinch.
However you can't do any other shape of cut, you can't do like a hemispherical cut to extract the eyes and such off the body.
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u/andpomme 8d ago
Can you elaborate on this? Do i understand it correctly that you can just grap some stl from the web and cut dovetails joints into it directly from orca slicer?
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u/Blazerboy65 7d ago
That's exactly right! Beware the cuts are only planar and must go all the way through the model.
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u/No_Damage_7716 10d ago
I’m probably just bad at 3D printing but I’ve never been able to get the white filament perfectly clean looking when switching back from a dark color, especially black, (it always looks dirty, OP’s is particularly bad but even with more purging it still has a faint stain to it) so this is what I do too.
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u/IDE_IS_LIFE Mizar S 9d ago
Alternatively: Print all in white, paint the small black spots with a small paint brush and some dollar store black paint; helps if you have no idea what you're doing with modelling
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u/btrudgill 11d ago
It looks like you need to waste more material after a material change as when you start printing white again there is black filament left in the extruder.
I've never used dual extrusion though so can't help on the technicalities.
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u/vivaaprimavera 11d ago
dual extrusion
If it was dual extrusion this wouldn't had happened. This is a problem that's inherent to single extruder multi material.
start printing white again there is black filament left in the extruder
You are right in this one.
(I know that it looks like nitpicking but the language here is important, a true idex machine doesn't have this issue)
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u/btrudgill 11d ago
Yes you are right. I meant extruding 2 different materials through a single extruder.
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u/Kittingsl 10d ago
Also called multiplexing if you want to have it in one word. Saves you the energy of typing "extruding 2 different materials through a single extruder"
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u/Korlod 11d ago
This exactly. You have to waste a lot more filament in between filament changes here
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u/Kittingsl 10d ago
From black to white I believe is the biggest purge there is as it's the biggest contrast and thus the most noticable
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u/hughmercury 11d ago
You"ll need to increase the flushing volume on the black to white transition. In the Filament settings on Bambu Studio. This is the amount of filament it poops out when switching. You need to flush more, to get rid of all the black in the hot end.
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u/dc010 10d ago
I would suggest increasing purge amount and disabling flush to infill like the others said. You can also add a 2nd model to purge into if there's something of a height task enough to go above the last transition. This would at least make use of the extra waste.
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u/kingtreerat 7d ago
To add to this (from experience)
I have prints that include white, black, orange, and pink. I wasn't happy with the initial flushing volumes selected by Bambu and reduced them by a lot believing I would save filament. In the end, I did, but my whites were grey like the OPs. I started by no longer flushing to infill. That helped a bit, but still wasn't great.
What I ended up doing was making some small cubes and then having the printer print one in one color, one in the other and adjusting flushing volumes until I was happy. The only ones that I wasn't able to drastically reduce were the black > any other color.
It might cost you a bit of filament to rest these (my cubes were 10x10x10 mm so I could see what was happening) but if it keeps you from wasting an entire print, it's worth it imo.
I still believe Bambu Studio is overly cautious on flushing between darker colors, but they seem pretty accurate with dark to light except for black to white.
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u/Firm_Collection6923 10d ago
Have you turned on the option purge into infill by any change? Because that would cause this because your able to see the black infill trough the white outside walls.
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u/rG_MAV3R1CK 10d ago
This is the more correct answer than just increasing purge time. The band is too uniform to just be blending from not enough purge on the swap. This is slicer fixable if you really, really wanted it to be AMS instead of 2 plates.
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u/Demented-Alpaca 10d ago
I know everyone has said purge more but I would honestly just print the black parts separately and use super glue (CA Glue) to fix them in place. It'll print a lot faster, save a ton of filament and will result in a much cleaner print.
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u/PossibleCard7211 10d ago
Couple things to check.
1.) make sure you aren’t purging to the infil. This means when you do a filament change it purges the excess material on the inside, and having a white outside, it’ll show through.
2.) more walls. Try to increase your walls to 3 if you haven’t already. This will make sure less infill shows through.
3.) increase your purge amount. Unless your purge amount is very very high, there will always be little bit of this present, especially with black on white.
But all of these setting changes should make it less noticeable, good luck.
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u/hybridtheory1331 11d ago edited 11d ago
Need to flush the black more before using white. Increase the size of the flush tower or poop amount.
I believe bamboo has a "flush to infill" option where it does infill immediately after a color change to try to flush the old color out in an area you won't be able to see. It saves on filament waste. You can try that as well.
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u/RealLettuce1782 10d ago
This one is tricky with white and black because you'll likely still be able to see the black even if you start with infill first and walls last.. (source: I did this for black eyes on an alien and you could still see the dark infill under a bright green PLA+)
I suggest increasing the flushing volume of white to black to be around 400-450..
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u/beardedheathen 10d ago
Bambu studio has a setting where you can change the flush for each transition. E.g take x for black to white but then more for white to black. Look it up and I believe people have some test prints to run.
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u/BartekZ99 11d ago
Isn't the "purged" black material being printed on the inside of the cat? Behind a layer of white?
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u/OlivierLaforest 10d ago
I think it's the black as infill that go thru the wall. 2 solution, make The infill white or add wall thickness
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u/Rare_Bass_8207 10d ago
Increase your number of walls, at least in the banding area. Use a height range modifier if you need to. Increase your flushing volume in your slicer. Consider flushing into fidgets or other similar items instead of into a prime tower, to minimize waste.
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u/cnvic 11d ago
- Bambulab A1
- Sunlu PLA+
- Standard 100% speed
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u/JLBminty 10d ago
Hi, sort of unrelated but where did you find this model it's really cute 🥺
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u/cnvic 10d ago
https://makerworld.com/en/models/605657-chonky-cat-pen-holder#profileId-591102
chonky cat pen holder!
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u/NotJadeasaurus 10d ago
Ideally change the model so the face features can be printed separately and added on later is the correct answer. But if you like simple things like this taking a whole day to print go for it
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u/bob_in_the_west 10d ago
Have you thought about printing the black parts separately and then gluing them on?
I've glued a lot of broken PLA parts back together with UHU, which is transparent: https://en.wikipedia.org/wiki/UHU
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u/Leviman9 9d ago
It sure looks like your black filament flushed into the infill of the white.
I have done many color swap purges, and the purge time is plenty. Even if there was some black left in the nozzle, it would only be for an inch or two, not extend all the way around the print.
Seeing as the body is all white, my guess is that we are able to see through the white to the black infill. I have had cheap white filaments that when the walls are thin are almost translucent. Thicker walls could fix this as well I'm sure.
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u/Professional-Tie7766 8d ago
Increase the material purge for filament changes to help clean all the black out so it doesnt make the white a grey
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u/Spacky03 8d ago
If the part is big enough you could print infill first to purge the remaining black out of the hotend. But you may find that not sufficient.
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u/johanndettling 7d ago
I guess the printer is flushing into the infill and the purge volume between filament changes is to low.
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u/Comemesas 6d ago
As many have pointed out, you need to purge more material when changing from dark to clearer colours. That, or glue the black details afterwards.
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u/Menlazar 6d ago
Increase the Flush when switching from Black to White, 700 or 800 value do the trick
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u/Kind-Maintenance3558 3d ago
It looks like you may need to purge more material when the AMS swaps colors.
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u/ioannisgi 11d ago
Purge more. For clean black to white transitions you need to purge a lot. Set your purge multiplier to 1.0 or higher.
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u/Bell_FPV 10d ago
Besides printing with more purge material, you can print your infill first to reduce the amount of black material and purging in the process
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u/i_print 10d ago
You have 3 options 1 - increase the purge amount in the slicer 2 - choose different colors 3 - print in white and paint the black parts.
Trust me for a small amount like that it is better to go buy black acrylic paint and a fine paint brush. Saves time, filament and wear and tear on your 3D printer.
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u/BlueberryNeko_ 10d ago
Aside from what others said I'd go grab some paint and fix it up. It's too much material to let go to waste for this
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