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moltenplastic

Molten Plastic's Open Source Forced-Air Vapor Resurfacing System

by moltenplastic Sep 22, 2013
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Where did the iced tea dispenser come from?

I am concerned about placing an unsealed electronic device capable of causing ignition in a highly flammable environment. Please use caution with this.

I have tested this many times. While Acetone is flammable, it does not combust explosively. Due to its density, the flame is more like sterno than anything, and not even that explosive. There are a great number of videos on Youtube which show how combustible it is, and what it takes to cause acetone to ignite.

After testing the system 12 times over a period of 96 hours, I did not have a single ignition. This was empty chamber, full chamber, acetone in a container, acetone in the bottom of the chamber, and so on and so forth.

The only time I could get it to ignite, was by intentionally exposing a flame to the vapor. And how did I put it out? I simply put the lid on the unit and it immediately went out.

Caution and safety should ALWAYS come first. You will, however, get a feel for what is safe and not safe after using acetone. Always seal the acetone container and put it up before proceeding past the fill-up stage!

Great :) Anyone tried this with Tetrahydrofuran on PLA parts yet?

THF is highly flammable and to use it in this type of device, I would need to put a mechanical gear/axle through the hole in glass jar to turn the fan, with the motor on the outside of the chamber.

It is very possible, I am just not sure its as 'safe' as acetone. (acetone is not explosive when it burns, and thus is much less dangerous than THF.

Excellent work! So, this does not require heating the acetone at all, right? As for the fan, did you have to find a specific model that is not effected by the acetone? Do you have a lot of extra features on the upcoming commercial version?

That's a true enough statement. There is no need to heat the acetone. It evaporates fairly well when the fan blows on it at room temps.

The commercial version will be a kit. Sans glass, (which can easily be obtained at any hardware store or big box lawn and garden.)
As I was telling Cerberus, it took three fans until I found one unaffected in any way by acetone.

Is the fan blowing down into the vat of acetone, or up into the model?
and I really like the design. as long as the fan is not effected by the acetone
it's golden!

I tried 3 fans before I found one that was impervious to a vigorous acetone rub and fingernail scrape. The current one could care less about acetone. it is a champ.

I totally appreciate the need for a convection type of airflow.
I tried a very primitive vapor treatment using a asparagus cook pot
(garage sale $2 project)
I simply put the object in, some acetone in the bottom of the pot,
the cage and the model, put the top on (with a weight on it)
set it in the sun for a while.
the results were much more acetone exposure on the lower part of the pot
and almost no effect on the top.
i guess i will have to experiment to find a fan that is not going to turn into goo.
thanks for a really good idea, I much prefer the non heated approach!