Acetone Smoothing is a well known process to any Maker with a 3D Printer.
You can Google it to see different methods as to how it’s done without any extra tools or cost.
One great advantage of this process, aside from the aesthetic looks of a smooth surface, is it actually allows you to 3D print at a rough quality settings with a thicker layer height.. for ex: 300-400 micron instead of 100 micron, mostly for designs that don’t really need a higher resolution like decor items, toys ,large prototypes etc..
3D printing at low quality settings also means faster 3d printing turnaround..
I chose this YouTube video amongst many as it shows you how its done with a simple Kitchen Jar, Acetone and your 3D Printer’s heated bed:
(First, you have to read carefully about Acetone. It’s a really unhealthy and dangerous product. Avoid contact with your skin and never breath it.)
Maker Tony Lock published his smoothing results of the Sticks Bowl, a Truncated Icosahedron i designed as a unique Bowl – 3D printed in ABS filament and made “Silky Smooth” with the Acetone vapor treatment.
First, he 3D printed it in PLA then moved on to try ABS & smoothing.
ABS & Acetone smoothing result – Great smooth surface.