Practical 3D Printers by Brian Evans

Author:Brian Evans
Language: eng
Format: epub
ISBN: 9781430243922
Publisher: Apress

Special Variables

Special variables represent a few features that can be reconfigured in OpenSCAD relating to the way that circles and arcs are rendered. There are three special variables that we will use in our model; each begin with the symbol $.

$fn

$fn is a special variable to set the number of facets used in a circle or cylinder. For the most part, we will leave this set at 0; however, it can be quite useful for creating other polygons, like hexagons. For example, if we were to make a cylinder with $fn set to 6, like so:

cylinder(h = 10,r = 5,$fn = 6);

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