pda/cellphone are cheaper/better/faster because of scales of economy. i think that these portable machines are powerful enough already to download and process stl files, and process gcode. i think it would be easier to use a device that has bluetooth because it is easier and more standard to connect with bluetooth than serial. bluetooth to serial kits can be purchased for less than 20$ such as here [cgi.ebay.com] . also Iphone has a version of python that works on it already.
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