Strugle printing large egg

Bambu Lab H2 Series Troubleshooting
1

Hi People,

Im new to 3d printing and wanted to print some large easter eggs but its failing to print the cone top part. i have the 0.6mm nozzle and ive tried printing in petg and pla plus (sunlu) both in spiral vase mode but these failed alot when getting to the over hang bit, i tried printing with the 0.6mm nozzle and bambu labs matte pla in white, with 2 walls and a 4% infill i was using 0.42mm layer height and had upped the line width to 0.8mm to make it nice and strong but to also print quicker, but this still failed when it got to the top. it looks as if the layers just stop sticking together and then it creates a mess. see the latest failure , with walls and infill.

im thinking it may be better to print it upside down but unsure if this will help

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2

Welcome to the forum.

Overhang is your main issue here. Without support, you will keep this issue. So settings might get you a bit further, but reaching the center without issues is virtually impossible without support.

Second thing that is bothering you here is the elastic band effect. Sometimes a large overhang is possible when you have a protruding feature, but here you have nothing where the bead can lay against.

First advice here is that while you are experimenting, that you lower the part into the bed, so that only the top (issue) section is above. Saves a lot of time and filament.

But I strongly recommend to use support. Assuming the egg has to be hollow.

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Hey , thank you for getting back to me , would I use tree supports or higher infill ? Or would it be better to print it upside down ?

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I can’t see the details of your part, but I guess the egg is made out of 2 halfs.

The printing orientation is best as it is, so the surface quality stays best.

When it’s 2 halfs, tree support would be a good idea.

When it’s a fully enclosed egg, infill is the solution, but I doubt that is the case.

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It’s one whole egg but the base isn’t sealed, would you recommend tree support for that then ?

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No, I would suggest infill. That basically supports the walls from the inside and is also rigidly connected. Support structures are intended to be removed and with an enclosed egg that’s not possible.

A full image of the model would help.

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Here are more pictures of the failed print .

The goal is to print a large egg 250-330mm ( the larger the better) that I can then light up.

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Vase mode is a bit tricky with curved tops. Even with adaptive layer height there’ll be a point where it needs to print in thin air.

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Personally, I’d go for a .4 nozzle, 2+ walls (depending on transluscency desired) and tree supports (also 2 walls due to the height) but that is just me.

:crossed_fingers: & :four_leaf_clover:

2 Likes
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So I’ve successfully managed to print these eggs in solid with infill but I’m getting these marks on the outside what’s causing them ?

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To me that looks like seams on “Random” or wet filament. From my own experience.

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I think seems may be on random , the ams says humidity is at 33% is that high ?

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Thats not awful. You still might want to get some desicant and do some drying.

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Turn off random seam and switch it over to scarf.

How are you going to fill with lights if you have all that infill?

Maybe I am missing something… but I am still not sure why you are not using supports.

(Ok… I see you are using infill because of @Gerrit ‘s advice, but I dont think he understood what you meant)

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Yes, Bambu recommends storage below 20% so anything above that must be considered high. However, that is probably not the real point here:

  • The AMS only indicates internal air relative moisture. As such, it only gives a reliable indication of current storage conditions. But filament moisture content is very different.
  • After an extended sea journey, moisture must be expected to have dissipated into the bag. So the only safe assumption for a new roll fresh from its bag is … that it is saturated. Only after self-drying do you know that the filament moisture is low.

So yes, I concur: Probably random seams with moist filament.

:crossed_fingers: & :four_leaf_clover:

Wet Filament
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That is why I was asking for more context.

As an egg with an open bottom, supports would have been my advice also.

OP was already trying infill in the thin walled object. At that point I also wasn’t aware of it being a kind of lamp shade.

Still my advice stands to sink the egg into the bed when testing support, before printing a huge egg again.

For keeping the surface quality optimal, I definitely would not print it upside down.

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can you explain the scarf settings, i will be looking this up aswell but i always appreciate what people reccomend that are helping anyway.

Additionally we are lighting up the eggs using a 10w led underneath the egg to make the whole thing glow, the gyroid infill effect gives it a nice effect when lighting up this way.

after i have a few more like this i will then try printing it hollow with tree supports.

Thank you

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