Inspired by http://www.thingiverse.com/thing:5998 .
Unfortunately, can not be made as-is. Hence the work-in-progress...
This is an OpenSCAD design suitable for experimenting with a deltabot with various arm lengths. The main parameters (base width, arm length, animation toolpath etc) can be changed on the fly.
It serves me as a test of both the coordinate transformation math and the resulting practical reach for a given arm configuration.
Parts of it can be reused in other designs, for example the 3d line and toolpath rendering.
Load the design in OpenSCAD. It is completely self-contained.
Switch on View->Animation.
Fill in the framerate (20 FPS is a good start) and the number of frames (160 steps will result in clearly visible movement).
Then start wondering whether this is a feasible 3d-printer design (all mechanics can be printed, it has a reach larger than the largest part) and whether an Arduino is fast enough to do the math.