this post was submitted on 04 May 2025
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[–] pixeltree@lemmy.blahaj.zone 25 points 1 week ago

I like 3d modeling cute lil creatures and printing them ;_;

[–] Jumuta@sh.itjust.works 14 points 1 week ago

the most useful things I've made with 3d printers are tiny, I feel like there are better tools for making larger things

[–] Xirup@lemmy.dbzer0.com 13 points 1 week ago (1 children)

I MUST see a video of those gears running

[–] Bbbbbbbbbbb@lemmy.world 29 points 1 week ago (1 children)

Iirc thats a device that exponentially turns slower and slower. Something like gear 1 turns every second and the last gear will move 1 tooth every 100 billion years or something stupid like that

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[–] khaleer@sopuli.xyz 9 points 1 week ago (2 children)

People often use biodegradabble printing substances so that's not that big of an issue. (Sometimes)

[–] unexposedhazard@discuss.tchncs.de 18 points 1 week ago* (last edited 1 week ago) (2 children)

I thought for a long time that PLA was biodegradable, but turns out it isnt really. It doesnt compost in nature, it just breaks apart into microplastic. It needs active heated industrial composting to actually degrade into something harmless.

[–] jabathekek@sopuli.xyz 8 points 1 week ago* (last edited 1 week ago)

Yes, almost all store bought items that are "bio-degradable" will not degrade in nature and require industrial compost facilities. You'll often see warnings like:

Biodegradable^*^

^*where^ ^facilities^ ^exist^

[–] BakedCatboy@lemmy.ml 4 points 1 week ago

For additional "reading" on the topic, makersmuse has a good video about this: https://youtu.be/jCsnVp6mEbk

For this reason, I started looking into trying out PHA (allPHA from colorfabb I think) which supposedly fully biodegrades. I nabbed a spool but haven't gotten around to printing with it since I print pretty infrequently. If it goes well, I'd like to make it my default prototyping filament. (Currently I use rPLA which is just post industrial recycled, and algae fill PLA for non-mechanical stuff).

[–] moonlight@fedia.io 14 points 1 week ago (1 children)

This is a common misconception. PLA is technically compostable industrially, but it will be very slow to break down naturally if you just leave it outside. It can take about 80 years, which is a lot better than other plastics, but it's a bit misleading that it's called biodegradable. There are true biodegradable filaments like PHA, but they're a lot less common.

That being said, 3D printing is actually really useful, and not a significant part of the plastic waste problem.

[–] riskable@programming.dev 9 points 1 week ago (1 children)

PLA microplastics take three years. That 80-years figure you've got in your brain is for PET:

https://www.sciencedirect.com/science/article/abs/pii/S0166445X25001547#%3A%7E%3Atext=In+fact%2C+slower+degradation+rates%2C%28European+Bioplastics%2C+2023%29.

(BTW: That study is brand new! From a few days ago.)

See also: https://cen.acs.org/materials/polymers/biodegradable-polymers-make-microplastics/102/i37#%3A%7E%3Atext=In+the+open+environment%2C+PLA%2Cover+another+several+years+%28Sci.

There's some confusion about how PLA breaks down because there's remnants after the 3-5 years where it's not detectable anymore. Those remnants are not microplastics at that point. They're just the base components (e.g. lactic acid) that can last a little bit longer.

Some colorants can last a really long time but I haven't looked into those as much as I have plastics.

BTW: The "sparkly bits" in "silk" filament is just mica powder (iron). It looks like it might be harmful but it's not.

[–] moonlight@fedia.io 3 points 1 week ago (1 children)

I think the 80 year figure was for PLA, as PET lasts well into the 100s of years (450 is the number I've seen)

This article claims 80 years https://3dinsider.com/is-pla-biodegradable/ but I haven't taken the time to do proper research about this.

It wouldn't surprise me if the science on this is divided, especially because conditions (and the shape of the object) vary so much. It seems very plausible that a thin injection molded PLA cup could break down really fast in a sunny pond in a warm climate, but a thick 3D printed object buried in the ground somewhere with a cold clinate could take many decades.

Anyway, it sounds like it's maybe not as bad as I thought, but it's still not good to treat it like typical biodegradable materials. Especially when pla microplastics are still harmful despite being shorter lived.

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[–] NarrativeBear@lemmy.world 4 points 1 week ago (1 children)

Seems to me like the second thing is a foot massager roller.

1000024664

[–] Zwiebel@feddit.org 3 points 1 week ago

No it'a a clock where the golden wheel makes one turn every gogol years or something stupid like that. It's just a bunch of reduction gears

[–] AdrianTheFrog@lemmy.world 2 points 1 week ago (1 children)

That's why i'll never buy a printer with an mmu. Multi print heads is better anyways. (although those are like multi-thousand dollars usually and I just have an ender 3 lol)

Idex is great too and can be super cheap (see: svo4) but no one cares about it for some reason even though you could do super cool things like multimaterial, printing support material vs infill with a wider nozzle, or printing two different parts at the same time.

[–] pixeltree@lemmy.blahaj.zone 1 points 1 week ago

I got an ams and I don't do typical multi material prints, I just use it for switching filament at layers for multicolor and for not having to manually switch filaments between prints. Takes a lot of the manual stuff out of the equation for me and I'm not generating extra waste with it!

[–] Korhaka@sopuli.xyz 1 points 1 week ago (1 children)

Isn't PLA biodegradable though, so not really a microplastic problem.

[–] piccolo@sh.itjust.works 11 points 1 week ago (1 children)

Biodegradable with industrial composting* Otherwise it breaks down like any other plastic.

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