There are actually two types of 3D printers: those that print with
plastic filament layer by layer, and those other ones, that have liquid
plastic in a bowl and a laser light shapes the item while a mechanism
moves it slowly out of that light-sensitive liquid. That second type of
3D printer produces very smooth surfaces, and is even much faster than
the first version, and even much cheaper (100 US$). If desired, I can
give a URL for that printer. Please let me know.

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