most 3d printing is done with PLA which doesn't create microplastics.
although other 3d printing materials can create.
this post was submitted on 04 May 2025
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What's that glove thingy good for?
It's a cast for injuries.
Now you tell me what the bottom thing is supposed to be.
It's an impossibly large gearbox. Even smaller ones would take decades of turning the first cog to move the last one.
Thank you. I've seen this post so many times, and this is the first time someone's said what that was.
Are you saying you move the first one and it takes years before the last one moves? Meanwhile all the ones in between are moving the whole time? That sounds impossible!
No, you'd turn the first one then the second would only move a fraction of the amount, and the third would only move a fraction of that amount, and so on.
Until friction and tolerances cancel out any kind of movement. A gearbox with as many stages as the one in the picture, the torque required to start moving the last gear is bigger than the first gear can handle.
It's because of gear ratios. For each movement of the first gear , the second only moves a fraction of that, let's say 1/20th. If the first gear moves at 1 full rotation a second, the next gear moves 1 rotation every 20 seconds, the next 1 every 400 seconds, and so forth. It adds up quite quickly, the tenth gear would take 16,235 years to make a full rotation in my example.
The picture above may or may not need more time than could exist in the universe to see any moment in that last gear.
I wonder how planck length affects a gearbox like that (but obviously the tolerances will come into play a lot sooner for a 3d printed gearbox)
I like 3d printers because they allow me to make my mechanical contraptions extremely fast and with ease comparing to, say, cutting them from wood. None of the stuff I make is going to revolutionize the world, but that was never the goal for me.
I don’t think the 3d printers out there are a significant producer of plastic waste in the grand scheme of things. They can actually prevent a lot of waste by making replacement parts or fixing something to meet a new use case.
But the narrative that they were going to revolutionize everything comes out of this idea that things are generally improved by the production of more stuff, more niche gizmos and doodads. It is a facet of the thinking behind over consumption.
Often that kind of thinking even gets in the way of implementing solutions to real problems. Much easier to sell people on an ineffective solution based in more stuff than a solution that requires them to alter their life style or accept a little inconvenience.
3d printers are just tools, but the idea that new tools are all that is needed to solve issues is a huge problem.
Most of the guys I know who have 3d printers are so eager to have someone ask them to make a specific thing for them on the 3d printer, and it's always really practical makes.
That’s me. Sort of. Don’t get me wrong, my wife is rapidly running out of room in her office for all the cute animals I have printed for her (that she didn’t ask for, I just surprise her with them sometimes 😅).
But I’ve rapidly reached the stage where I want to print but have covered most of my own needs for printed stuff. So any time anyone asks if I can print something, I’m thrilled.
I mean, making cute animals is part of most hobbies. I have created more little animals with crochet than I can count, and I don't necessarily see 3d printing as anymore wasteful than crochet
Yeah I've done a couple prints for friends or relatives. My most recent print is a simple miny peg-chess set so I can learn from my chess books with a physical board and pieces.
Not exactly practical, but still useful.
I've successfully solved several real life problems with my printer, and it's always nice to find something practical to make or fix.
Is there a reason the board is 3 colours?
So that's a fun story. The light squares and pieces are all printed from the same color changing filament.
I printed all the squares first, after putting them in, I realized I was missing one. And I was already printing the pieces. After removing several of the squares from the board in preparation for replacing them, I found the one I thought I lost (or didn't print). Sadly removing the squares ruined several of them. So I was locked into replacing with newly printed squares. And because it's color changing filament, they're different from the second print.
Anywho. Long, boring, (turns out not fun at all) story. But I thought it looked pretty cool in the end.
For 3D chess?
IDK, but it certainly looks aesthetically pleasing, to me at least.
this idea that things are generally improved by the production of more stuff, more niche gizmos and doodads. It is a facet of the thinking behind over consumption.
Yeah like look at all the consumer tech we have now, and are we any happier? There's a cruel optimism to chasing these gewgaws.
There's that, and also looking at "technology" (in the general sense) as this messianic thing that will eventually save us all if we just keep accelerating and inventing things and crashing forward into the future — we'll eventually tumble into the beautiful green glade at the end of history where nothing hurts and all is harmonious — all without ever having to do any messy introspection or trying to solve our problems with what we have right now.
Anyway it's foolish. But I blame the owners more than the consumers.
It's tools and behavior that will produce change. If we have the tools but fail to change consumer behavior, overall change will be negligible.
If I use a 3d printer to print all the replacement parts I would have had to order specially otherwise, I am benefitting from the tool. But if those facilities keep making the parts I used to order, and the market overall focuses on ordering rather than making, not much environmental benefit is made from me not having things shipped to my door.
That doesn't condemn the tool or the market, but the problem is this technology can't have greater impact unless it changes consumer behavior at a critical mass, rather than just hobbyists.
I highly doubt that 3D printing of all things is making any meaningful contribution to the microplastics problem. Plastics are absolutely everywhere, so it feels weird to pin blame on a small group of enthusiasts just making silly shit at very low volumes.
I fucken repair shit with 3D printed parts so that I don't need to buy new shit.
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Not only that but most 3D printing is done with PLA which doesn't generate meaningful microplastics. I mean, it does but they only last a short time out in the wild. A study funded by the state of California found that PLA will last up to three years of left out in the environment (e.g. not in a trash dump).
Three years is nothing. Also consider that many animals can eat and digest PLA. Furthermore, if it ends up in your body it will eventually be broken down.
The real microplastics problem comes from tires and plastics like ABS that are used in f'ing everything. ABS microplastics last like 400 years or something like that.
Other plastics last even longer but the studies I've looked at all suggest the same thing: Tires and ABS.
Even PET water bottles aren't as bad because they only last 80-100 years (until *fully" broken down). That sounds like a long time but also consider that PET fibers are mostly inert and don't seem to absorb and re-release nasty things like ABS.
Don't get me wrong: PET microplastics (which mostly consist of tiny fibers from textiles—not from bottles) are 100% a problem. They're just a fraction of the problem of everything else.
For reference, the biggest problem with PET fibers is that they float and can be carried by the wind. That means they tend to settle on top of soil which causes it to absorb more heat and retain less moisture... Requiring more watering. Whereas the butawhateverthefucktoxicshit that tires break down into can result in soil that's harmful to life (in general). Enough of it and nothing will grow at all.
That's why you rarely see weeds sprouting up from kids playgrounds that were filled with chopped up car tires. Well, that and the fact that they can get really hot.
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This seems a bit strawman to me, no? The people who are doing crazy builds with hundreds of parts are often doing it specifically for your social media impression. Most of the stuff I print on my Prusa is small parts for my bikes or my car. Little missing pieces of fixtures around the house. If I'm ever printing something feckless it's because a friend really wanted a 3d articulated slug. I will say though, the waste plastic from edges, supports, failed builds, etc adds up over time and it's dead-end waste like most other plastic. I have several paper grocery bags full of the stuff. But that's exactly why I don't like printing feckless crap.
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I don't hate 3d printers I think they're an awesome technology, but enthusiasts sure love printing bullshit
what's the bullshit gear thing in the bottom example?
Many reduction gears, so each turn of one is a fraction of the turn of the one next to it. Pretty pointless.
ah ty
It's easier to print bullshit than to learn cad. I'm learning to model by printing gridfinity organizers. It's easy and practical. I waste less time searching for junk and waste more time modeling the bins. 👍
I think at least 80% of my printing is organizers.
It's beautiful 😍
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