The purpose of the Delta 3D Printer Project was to allow for rapid prototyping. The electronics were based on off the shelf components to allow for this project to be completed as quickly as possible.
The complete Bill of Material (BoM) was kept as low as possible and ended up being at least half the cost of any commerially available unit and cheaper than most kits.
A key design aspect of this printer was to keep the number of printed parts to a minimum. Although this goes against most 3D printer designs, it was necisery because access to other 3D printers were limited during the build of this printer.