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Erlman

Bole

by Erlman Nov 13, 2014
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toxic? why? are we planning on eating the bowl? lead from the brass in your nozzle? wtf?

how sure are you that its free machining brass that contains, oh, about 0.5% lead? well forget about the zinc and copper and any other elements present as impurities in brass...

how sure are you that your steel nozzle is ONLY iron and carbon, and also doesnt contain, oh, about 0.5% lead for easy machining?

iunno, but in my experience,when something is only going to be heated up, and the main requirement is that its machined easily and quickly for profitability, then the alloy itself becomes irrelevant. they get whats cheap.

your steel contains lead, beryllium, bismuth, arsenic, various radioactive wastes if it was manufactured in the last thirty years, nickel, possibly molybdenum and chromium, some manganese, sulfur, etc...in fact, unless it was expensive...just about every element on the periodic table in trace amounts...

one, i wouldnt use it for food, as you cant wash it... in hot water, at least, if pla.

abs might do, especially after acetone bathing...

but then, the printed stuff is always going to be slightly porous, being non-homogenous.

so theres lots of little cavities for the bugs to breed in but...

seeing as my BODY is simply a colony of bacteria with ideas above their station...im not flustered.

end rant. these nancy pansy cotton wool clad keyboard warriors with no common sense grind my gears...

tch tch... minus points for the person that cant use the "rotate" function in their printer software :)

to the designer...my only gripe is i dont like two part prints :( looks nice though :)

It looks great but the on-edge positioning of parts gets minu points.

I thought your bowl would make a good wrapped candy dish for my office, but there seems to be some issues. I tried printing the base on my Replicator 5th generation. Flipped the base so it would print with the bottom of the base against the bed. Seems the bottom of the base doesn't consistently touch the bed. I've tried printing with rafts and supports and it just ends up being a knotted blob of wasted filament.

About PLA and food contact:
There is this report about PLA http://www.sciencedirect.com/science/article/pii/027869159400145E Safety assessment of polylactide (PLA) for use as a food-contact polymer published in 1995 and published their results in Food and Chemical Toxicology.

Highlights from this report:
They tested PLA under a variety of typical food storage conditions and measured what leached out into food-simulating solvents, such as Ethanol (what you find in liquor) and acetic acid. The storage conditions were varied with a bunch of short and long term storage conditions. They even heated the some samples to 60°C to simulate food serving conditions.

The study found that PLA is Generally Recognized As Safe (GRAS) when used in contact with food. Their summary concluded that PLA releases a small amount of lactic acid into foods. Lactic acid is a common food ingredient, that is even found in breast milk. They estimated that the amount of lactic acid people would consume from PLA to be about 700 times less than the lactic acid intake of breast-fed infants.

Most PLA is derived from stuff like corn, potato and tapioca. (I think MakerBot said theirs is made from corn, but it is not food-grade corn. It's the grade corn used for making ethanol). The report recommended that any PLA plastic that was used to be free of dyes, so you should use natural "color" only.

The report also stated PLA was not a good storage solution due to bacteria growth in pores of material.

The report was about PLA being used in molded products, not printed products. Some folks in the printing forums have suggest coating the object in a silicone based food grade sealant, but I have no research on this and to be food-grade, your nozzle (and other metals coming in contact with the plastic needs to be stainless steel).

I see people mentioning non-toxic.. but beware, just because the plastic is non-toxic does not mean the other chemicals infused into the material are by your nozzle. Also no matter how good your print is, extruded PLA is porous and will harbor bacteria like a sponge. A quick google will give you more details. Don't use this as your cereal bowl unless it is injection molded in a food safe environment/setup. I like the concept though.

It doesn't need to be injection molded, however a few precautions do need to be taken ..

While the FDA recognizes PLA as GRAS, you should really use something like Taulman T-Glase, which is FDA approved as food safe (Most other PET filaments will be too, such as Colorfabb XT)

Also you should use an all metal steel hotend, like the E3D. Brass contains trace amounts of lead that can be toxic to humans.

The E3D comes with a brass nozzle which CAN be used and WILL NOT transfer enough lead to be noticed in your body, but E3D also sells a steel nozzle to replaced the brass one.

Now while an all steel hotend is good for food contact, you do need to make sure it's clean. Though you should generally keep your hotend clean anyway.

very good point IVIUPPET thanks for the info

What material could this be printed from that is non-toxic?

PLA is a great non-toxic material that i used and it worked very well.

I thought I recognized that bowl from DT!
You're featured on the front page at the moment

You may want to consider rotating your STLs so that they are print ready, adding an actual photo and mentioning the type of material you printed successfully with. That kind of thing will encourage other users to print your stuff.

awesome! yeah i forgot to take one but i will do that on Monday thanks for the advice!