# Tag Info

22

Ok, I tried all 3 materials. PLA failed after less then one day, I believe it deformed from the constant pressure and fell out (I didn't find the part but I didn't really search for it, there's some tall grass below the window) ABS lasted about a year, it fell strait down and I found the part, it looks ok if probably deformed by just a few mm so it doesn't ...

20

Food safety is a property of both the process and the material. You can't stick food-safe material in a printer that has previously been used to print something food-dangerous and expect the result to be food safe. The only way to know if a given material is food-safe is to ask your supplier, but a lot depends on how you then process it. For instance, FDM ...

18

Normal PLA is non-conductive. You can take an $\Omega$-meter to a test part if you're really concerned somehow you have some PLA that is conductive. There is a caveat that your color may include metal flake or graphite of some kind. Depending on the density it may be conductive. But I've tested my silver on hand and it gave me infinite resistance.

13

PLA would be a non-starter for outdoor use as it's biodegradable and can breakdown in sunlight. Albeit slowly, but won't be useful for long term project. ABS would be a good choice for longevity, as it can last in outdoor situations for quite a while. Its glass transition temperature is above 100 degrees celsius so it'll last in most climates. As for ...

12

I have never used ABS, because I have a young child at home and no ventilation system (just to be safe). I have however used PETG, a crystal clear brand competitively priced on AMA-ssive online retailer, I loved it and will probably only buy it in the future. Advantages Noted: There is no odor I could detect It is remarkably clear, like glass using a large ...

12

PETG is great stuff to work with. It is stronger than ABS also. It prints slower than ABS and PLA. The formulas vary quite a bit from vendor to vendor. I have used 3 brands, and each of their properties vary. From my experience you do have to be careful with moisture. You'll be able to tell you have moisture in your filament if you start hearing a slight ...

12

I found much the same question at Does PLA outgas? An answer there pointed to a NASA outgassing database, Outgassing Data for Selecting Spacecraft Materials, and says that: ABS (unknown supplier), MakerGeeks PET and Makerbot PLA have been measured and are listed in the NASA database. Poster there recommended PLA for lower outgassing, and clear PLA ...

12

PLA itself falls in the category of non-conductors, with a resistivity ($\rho=R\frac A l=\frac 1 \sigma$) in the order of $10^{16}\ \Omega \text m$ (see here), similar to other plastics. Following image gives an idea of the values of resistivity for usual conductors and isolators, insulating materials have resistivity greater than $10^9\ \Omega\text m$, ...

11

Almost all of the FDM materials outgas even at normal atmospheric pressure, and, in fact, most plastics outgas. Further, FDM and many other printing processes do not guarantee no internal voids - meaning that putting a 3D printed object into a vacuum may result in breakage, cracking, and possible explosion hazards. For this reason I would focus only on SLA,...

10

Updated to match the improved question format. There are a few ways to reduce material usage. First is what you have touched on. Which is to reduce the design by punching out holes, and removing all material that does not add anything to the structure. Even better is what you touched on, reducing it to the point where your print is more like a suspension ...

9

PET(G) is a strong contender. It is very strong and water-resistant, and as such is often used to make pop bottles. PLA has a reputation for being "biodegradable" and therefore it is often discouraged to use PLA outside and/or in contact with water. However, PLA only biodegrades under very specific conditions which it won't generally be exposed to so it can ...

9

Food Contact Substances There are regulatory agencies in most developed countries that regulate food containers. In the USA, the Food and Drug Administration (FDA) regulates Food Contact Substances (FCS) which are materials that come into contact with food during production, manufacturing, storage, packing, and use. They have many lists of FCS which are ...

8

There are 3 things that might affect food safety of 3D printed objects: The filament - it's food safe only if it says so on the package (even if the plastic is not toxic you don't know about the color and other additives) The hotend - the hotend and nozzle may leak metals into the filament, you need something like a full stainless steel hothead. And finally,...

8

I might be late to the party, but I have a suggestion. Why not use ASA filament, it's the kind of plastic used in car cup holders, lawn rakes and sprinkler heads, it is both heat and cold resistant, as well as solar stable and weatherproof. As far as printing with it it is similar to printing in ABS as far as I am aware, I might be wrong though. I personally ...

7

PLA is non-conductive at room temperature, but when you heat it up over 70 C it is no longer as great an electrical insulator as the part will begin to fail. These temperatures could occur in electrical shorting situations or even increased electrical resistance in a circuit over time. I would hesitate to use PLA in electrical scenarios with a lot of load. ...

6

In addition to what @AsaDeDeBuck said, PETG is also more flexible than PLA, and less stinky than ABS. Furthermore, some PETG variants like to accumulate on the nozzle (particulate build up) and then char a bit before being deposited at some random spot on the object.

6

PETG is great, but definitely not as easy to print as PLA. However the advantages of higher impact resistance, temperature resistance and longevity make it superior to PLA for parts that require those properties. ABS is even harder to print than PETG and has worse strength and layer adhesion so no reason to bother with it in my opinion. I print PETG at 80°...

6

A few things are required for effective extrusion-style 3d printing materials: It must stay where placed by the nozzle long enough to harden (or, alternately for pastes and such, have a shear-thinning or thixotropic viscous profile so it will not flow under its own weight). If using a filament extruder, it must have a wide range of viscosity that varies ...

6

You will really need to specify your constraints better because the short answer is yes, what you describe is entirely possible, but without knowing whether you are limited to a particular budget, process, or aesthetic, it's not a particularly useful answer. Some machines (ex. Stratasys Connex 1000) will print models up to 1m in length, so sure, you could ...

5

This naturally depends on the ultimate pressure you require. I have made a few tests with LEGO pieces (ABS) in vacuum and reached 10-5 mbar without problems. I did not try to go any lower. Otherwise, have a look here: A 3D printed beam splitter for polar neutral molecules. A Formlabs Stereolithography machine was used there, producing a material that ...

5

I think the closest you're going to get is with a composite material. Over the last 2 years or so, there have been more and more composite filaments emerging on the market for consumer 3D printers. I good example of composite filaments can be seen on Proto-Pasta. Since the filament must mostly be comprised of the polymer "binder", the material will obviously ...

5

I"m no expert on this, but the article at https://en.wikipedia.org/wiki/Amorphous_metal may be relevant for you. There are some special alloys, such as gold/silicon and various titanium-based ones, that become "bulk metal glasses" if cooled extremely quickly (for example, by sputtering onto a spinning cold surface). The speed of cooling prevents crystal ...

5

The closest thing you will find is Woodfill plastic. As time goes on we are seeing more and more PLA that is infused with other materials. Woodfill will look and feel like waxy wood. We are pretty used to seeing fiber boards and the like so this will not come off as odd. However it is not quite cardboard, except that it is also a wood product. It will also ...

5

Elastomers do much better on direct-drive heads (pulled to the head by the motor) than on Bowden designs (where the material is pushed to the head by a motor). This is because the flexible TPU or TPE can bend in the guide tube, causing lag during advance/retract changes, and sometimes even bind up during delivery. Look for equipment which explicitly states ...

5

It is difficult enough to make 3D-printed objects water-tight (unless you paint them). Making them permeable to air but not water vapour is too big an ask, I think.

4

I spent some time looking at making an FDM machine that would print bronze filament. An alloy commonly made into wire had a difference between the solidus and liquidus temperature of only 50 degrees C. I determined that one could make a conventional hot end, electrically heated, made of either molybdenum or tungsten. I did not determine how the bronze ...

4

Achieving this with 3D printing would be quite difficult, and you might be better served by creating this effect some other way (I would personally recommend getting some inkjet transparencies and stacking a few layers together: an entirely black layer, and a few layers with the symbols in negative space). One way that you might be able to achieve this ...

4

The solvents that can dissolve PET are pretty nasty -- I wouldn't personally handle any of them outside a lab fume hood. If you have that, a 50/50 mix of MEK and methylene chloride should work. (Increase MEK ratio if you want faster adhesion / less working time, and vice versa.) First thing I would try is printing directly onto the (super clean) glass. ...

4

What I tried and worked is to apply water based normal Glue-stick on the tray and with few drops of water distribute it evenly across the tray surface, let it dry and then you are good to go!

4

Tough set of requirements and definately pushing into the professional domain. I would recommend checking out ULTEM 1010 Resin which is similar to PEEK but has a higher glass transition temp of 215 °C. Check out the spec sheet from Stratsys. I hope this helps. :-)

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