I heard, a common practice in 3D printing is, to use acetone to smoothen
surfaces afterwards where applicable. I joint some 3D Printing groups on
Facebook.

Besides, I am really not so sure, how high the pressure on that plastic
part is. The grinder came with a number of other plastic parts that can
be mounted at the same location outside, where I want to mount this
plastic part. And they have the same wall thickness (strength) as the
part Scott and I developed. I think, I still want to give a try.

But in regards of the micro fauna and the fact, that 3D printing today
(when done with a layer printer) is having a rough outside, I give you
the point easily. I hope, with some acetone I can smoothen the inside.
And otherwise, good cleansing afterwards and also before, each time.

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I am still trying to find a solution in regards to my round grinding
blade. If you know any good machine shops, please let me have their
contact information. I am aware it will take some money, but need to
find out, how much. Thanks.   :-)

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