Josef Prusa 的 X 帖子

Josef Prusa @josefprusa 原帖 ↗

PSA2🚨 Today is a great day to talk about 3D printing safety 🤓 Another elephant in the room is "fumes" from open-frame printers. TLDR: It can be safe and I have the receipts ⤵️

The "fumes" are basically two things - particle and chemical emissions. They are affected by two things - the filament and the printer.

The filament is made out of polymer and additives. If something is labeled as PLA it can be made from an infinite amount of combinations of polymers and said additives - one can be safe 🌳 and another one dangerous ☣️

On the printer side, it is mostly temperature and the time for which the material is heated. Overheating the material to achieve higher flowrates may easily turn safe printing into a gray zone or danger 💨 The CHT style nozzles are onto something - more flowrate without overheating.

The only way to be sure is by testing and fortunately there is a new standard UL 2904 - Standard Method for Testing and Assessing Particle and Chemical Emissions from 3D Printers.

We've done some UL testing before - our @Prusament PETG V0 self-extinguishing filament is the first 3D printing solution to receive a blue card from UL in combination with MK3, MK4 and XL - https://blog.prusa3d.com/the-new-prusament-gets-ul-certified-were-launching-a-new-self-extinguishing-petg_80711/

As you can see, these things are always tested as a combination of material and the printer. On top of that it takes a long time. But we have the first results in from UL 2904 testing.

90% of the prints are made with PLA and PETG (over the years, even businesses started to lean towards PETG from more advanced materials) based on our research. This makes a great starting point for the certifications.

Based on the testing in the UL lab, Original Prusa MK4 with Prusament PLA and Prusaments PETG received Greenguard certification ✅🥳 It is the first and only desktop 3D printer with this certification 💪 The Nextruder performed extremely well with the @prusament - great job team 👏

You can always verify on the UL website:
https://spot.ul.com/main-app/products/detail/669e57e67a4398412a3f6680?page_type=Products%20Catalog

Next time we will talk about the enclosures and filtration systems for more advanced materials - again not all are created equally 😉