cloakfiend 995
Oh my! I haven't posted on this thread for over 7 months!
Unfortunately There is no magic amount of time, this is something you need to figure out as it ALWAYS depends on the material and stuff. I wish I could just say 10 seconds or 25 like I did before, or 45 seconds max like my old limit was. But I'm much more experienced in doing it now, its like cooking, I judge in the day and during the moment. Like a cook does adjust according to the weather or detail of the model as some parts might be too thin for a dip. I might use new acetone for some things and used dipping acetone for others. You really need to practice (safely of course).
As for the whiteness thing, my perceived explanation is a bit too convoluted to explain here, but basically i think it is related to time of exposure to oxygen (and stuff) basically, you can use Ethyl acetate and wax if you dont want it, but again I now know the long term effects of acetone as I've used it for over 3 years now. (and i have no hypersensitivities or ill effects from it!) The other chems.... not so nice!!!! Ethyl acetate absolutely stinks and is a nastier version of acetone, and methylene cloride is not so bad.
To all new people who don't want to read this entire thread, Acetone smooths PLA/PHA from colourfabb printed at 0.06 layer resolution in a way so that only a light sand is needed to remove imperfections. You will not need filler and sanding for many hours, that is why you are spending more time printing it out at 0.06! so you can do less manual labour!!!!
To know how i apply it, just watch the vids and find a method that suits you.
Acetone also makes your prints water tight, by changing the chemical makeup and also slightly shrinks compressing the form (not much unless you soak it for ages. it can also warp and split your models revealing any weak points! it will not split a good print if done correctly.
The part is ready when it is hard and brittle BTW. But I like to work on it during its transformation phase as sanding is strange and leaves no scratched which makes clean up super easy.
Unfortunately I have far too much to say on this topic and i feel im just making things more confusing!
Feel free to ask but dont expect everything i say to make sense at first!
Strange, my last post was edited by......GUEST?
Edited by cloakfiend
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cloakfiend
ACETONE AND COLORFABB RED TR FILAMENT EXPLAINED AGAIN....HOPEFULLY A BIT BETTER Ok so I have a bit of time spare during my night shift so I thought I'd have another go at explaining how th
geert_2
Results before and after "acetoning". These are just old scrap pieces, which I kept around for testing. Material is colorFabb PLA/PHA, Dutch Orange. Printed with 0.4mm nozzle,
geert_2
Thanks for the info. So I will go the "cooking way", and just experiment. :) The shrinking might be a bit of a problem though, as the silicone castings should keep their shape and fit: th
Posted Images
geert_2 557
A question: how long do you let your models dry after smoothing with acetone?
The goal is to smooth the layer lines of a PLA/PHA mould, for casting silicone models into it.
For testing, I dipped a scrap print (colorFabb PLA/PHA, red) into acetone for a few seconds, and after more than an hour drying now, it is still flexible and still emits an acetone smell. So the acetone seems to penetrate far deeper than I expected. Only the thinnest parts are now getting white (just as seen in some of your photos) and seem to be drying.
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