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Acetone Finishing on PLA

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Posted · Acetone Finishing on PLA

I did notice that because of the hat on the model, the layer lines where much better than normal on the freddie models face due to it being shielded with support material, which indicates a wall around the object might beneficial in surface quality. both models were printed with identical settings one day apart. 

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Posted (edited) · Acetone Finishing on PLA

These photos show the effect of acetone on a part that I left on purpose in acetone for way too long (more than an hour), just to try what would happen. It got weak, lost its spring-effect, and cracked. Its strenght recovered somewhat in the next months when drying, but not fully. Now I broke it.

 

So you can see how deep the acetone penetrated and cracked the model. The inside seems to be still chemically affected, as it broke in a weird way, with very different inner and outer fracture surfaces. This is yellow PLA/PHA from colorFabb. The fracture surface is ca. 6mm x 4mm.

 

image.png.9b3832d4b43a9d14d5c98dbed86c525e.png

 

image.thumb.png.fe91b2a7b31fc1a55242fc065103c234.png

 

Edited by geert_2

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Posted · Acetone Finishing on PLA

Yes indeed. Acetone goes deep. Deeper than Eddie Murphy going undercover in Bevery Hills Cop. 

 

It can also shrink. A lot! Ive done many tests on this. Its why you need to be very careful with exposure times and why brushing is less prone to warping than dipping which can play havok with hollow models.

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Posted · Acetone Finishing on PLA

Another thing is fire places and sources of intense heat or constant heat will affect the models a lot. The acetone tends to dry them out and intense heat even further causing rapid splitting. Also heating up a closed hollow model after acetonig can cause the model to inflate as acetone reaction seals the model from moisture... once you know how it reacts you can pre determine how to do things.

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