I've made a small CNC machine from old computer parts that is too weak to do anything but draw with a pen:
https://sites.google.com/site/0miker0/
I would like to purchase a stronger machine that can cut plastic or small pieces of wood for as little money as possible. So far the cheapest machine I've found is a Zen Toolworks 7"X7" machine. Searching for ballscrews and linear slide parts on ebay to build one myself would end up costing too much. Is there anything out there similar to the Zen Toolwork machines price that I am not aware of?