What they’re saying is basically: We have no clue if 3D-printing can cause cancer, but better be careful.
Yeah, I didn’t know that before.
This study looks at how particles released from 3D printers (specifically using ABS and PLA filaments) can damage cells and potentially lead to cancer. They found changes in gene expression linked to cancer development, but they can’t definitively say 3D printing causes cancer yet.
If you read the full study, though, it’s clear that exposure to these particles affects cells in ways that suggest further research is needed to figure out just how dangerous it is, not if it’s dangerous. The study avoids outright claiming that 3D printing causes cancer because it was mainly designed to assess cellular responses to particulate exposure, not long-term cancer outcomes.
They did see cellular changes linked to cancer pathways, but the study’s design didn’t allow them to draw that direct conclusion. A follow-up study focused on these gene expression changes and long-term effects is likely to show a clearer link between 3D printing exposure and cancer development.
That being said, this isn’t the only study. For instance, particles emitted during 3D printing—especially ultrafine nanoparticles—have been shown to cause cellular damage, oxidative stress, DNA breaks, and inflammation, all of which are early indicators for cancer development. In one study, exposure to ABS fumes led to a 49.5% decline in cell viability, pointing to high toxicity levels.
Other research has suggested that people exposed to 3D printer emissions have a cancer risk 3.44 times higher than those exposed to typical urban pollution. To be blunt, it’s pretty well established that the particles emitted from 3D printing processes are biologically active and harmful. I think that most people engaged with the hobby probably know that intuitively, which seems borne out by the tenor of many of the comments here.
It’s dangerous, and it’s likely shortening your lifespan in the long term. You might not care now, but if you get cancer in a decade or two, I imagine future you will feel differently. “Do you” and all that, but I’m amazed by the amount of people 3D printing without air filtration and vent hoods. The fact that some people do this in the open air in their living spaces is mind boggling to me.
Can you share these studies?
And reading this I’m now considering getting rid of my printer
Honestly, I love 3d printing, but I still worry about microplastics in the environment.
It’s complicated but PLA is bio-degradable … eventually. Not months but years. That’s much better than the horrors you see on Blue Planet II.
PLA requires industrial high heat composting to breakdown. Otherwise it will be around as long as any other type of plastic.
Is this true also for microplastics? I am aware of the marketing claims and the helpfull oversight of the needed bioreactor but i thought that was in part due tl the larger pieces. Wondering about micro
I don’t have a 3D printer but if I did I would try to keep it in a basement or garage, or at least keep a window open
Uneven airflow results in bad prints. Better to set up a ventilator hood that exhausts outside.
Plus humidity is bad for your filament.
I just don’t go into the room with my 3d printer outside of checking on it, and then I usually forget that my print is done for like an hour so the smell (and hopefully cancer) is long gone.
Plus humidity is bad for your filament.
I keep on hearing this but it does not check out for me.
I have a Prusa 3S+, self assembled. I do not do a great deal of printing and go through phases. I did a flurry of prints during the pandemic and then it rested idle in our rather cold and slightly damp study for a couple of years. When I bought it, it came with a spool of silver Prusament which worked nicely. I then bought a spool of “Sunlu” filament (Chinese firm off of Amazon) and then a box of 10 colours of the stuff.
I recently got the printer out and updated the firmware, re-calibrated it and so on. I’ve done several prints with filament that has been open to the environment for at least two or three years and its fine. I have done a print using some transparent filament which was unopened and that was fine too. The unopened stuff was vacuum shrunk wrapped so could not possibly be damp. The opened filament was stored in the original cardboard box in a slightly damp and unheated room.
For me the main issues for a decent print are:
- Adhesion on the plate. I actually used glue for a print for the first time recently
- First layer calibration. If the first layer is wrong, the rest is wrong. You need to get the right amount of “squashing” to get a smooth bottom
- Always clean the plate between prints - a squirt of EPA and a decent rub with tissue whilst the bed is heating up does the job
- Keep the guide rails lubricated - Mine whined that all three axes were too tight or just wrong and yet the Prusa app to check belt tightness and forum and wiki advice said it was fine. Any engineer will tell you to lube up when in doubt - do it! X, Y and Z.
I will try repeating a challenging print with filament that is way older now and see what happens. I printed a couple of tank models in red around four years ago. Both involved their turrets with the barrel facing upwards - that’s a lumpy cylinder about 4cm long and 2mm wide.
I have seen some notes about PLA being hydrophylic (absorbs water) on the Prusa website’s official advice but I don’t personally think it is an issue and people are probably missing another factor or factors that is fucking up their prints. I think the filament dampness meme is “cargo culting”.
PLA is heated to around 220C whilst being extruded so any water will steam off very quickly as water vapour - which is not even “wet”, well before worrying a print job.
PLA is touted as bio-degradable and it is … eventually. It is extremely stable, despite being derived from corn starch. It really doesn’t seem to care about a bit of water hanging around. That’s why I can print new hinges for a plastic garden storage thing to replace the original ones and they last through winters and summers in the UK.
So, if you think moisture is an issue for PLA filament used for 3D printing, why not do some experiments and then decide for yourself.
I’m happy to be proved wrong.
Perhaps, but have you actually tested this for yourself?
PLA is extruded at 220C in my Prusa beastie. Once the filament is slapped on the model, I probably want it to to fuse to the previous layer really well and then cool really fast and become stable.
We need to provide working and results rather than “I think that”. My printer is quite close to a very large double doors to outside, which open and shut as required.
Mine live outside in the garage , I built a Corsi-Rosenthal box (box fan with a bunch of filters on it) that stays on out there, and both of mine are in fairly decently sealed enclosures with HEPA+Carbon recirc filters.
Don’t go in there when printing unless absolutely necessary, and even then, minimise exposure.
I could tell you that it was a surprise for me but it’s not and I also have a resin printer. Have you smelled that? It’s the smell of cancer building up in your brain! But to be fair, so it’s cola, coffe, fastfood, processed food, cars, every material used for building and keeping your house clean and anything diet… so you know… I was already going to have cancer, at least now I got to play with some toys while dying
Edit: Just wanted to add that my BIL was 43 yo, vegan, fit, would work out and swim 7 days a week, would eat salad from his own backyard, lived in a rural “clean” area and meditate and didn’t like technologies… died from cancer at 43. I’m a fat slob that resin prints for 3 years and already outlived him
Please don’t have resin in your room. It’s nasty, and use gloves to touch (I assume you do), you can get chronic dermatitis from uncured resin
I keep Ender3 V2 in an enclosure and try to keep it as closed as possible when I take out my prints. Doesn’t hurt to be safe.
