We just came across this excellent list of free 3D Modelling and CAD tools for the creation of 3D printable files. 

Enjoy!

http://wiki.imal.org/howto/3d-modeler-cad-softwares

To help our search for our first 3D Printer purchase we have compiled a list of different prices and specifications.
 All printers are costed as assembled excluding delivery. The information is accurate as of May 2013.

Ultimaker
Price: £1450 
Bed size: 20 x 20 x 21.5 cm
Bed volume: 0.0084 cubic metres
Resolution: 0.0125 mm
Plastic Filament: 3 mm

Makerbot Replicator 2
Price: £1460 
Bed size: 25 x 16 x 15 cm
Bed volume: 0.006 cubic metres
Resolution: 0.09906 mm
Plastic Filament: 1.75 mm

Up! Mini
Price: £595
Bed size: 12 x 12 x 12 cm
Bed volume: 0.0017 cubic metres
Resolution: 0.02mm
Plastic Filament: 1.73mm 

Up! Plus
Price: £992
Bed size: 14 x 14 x 13.5 cm
Bed volume: 0.0026 cubic metres
Resolution: 0.015mm
Plastic Filament: 1.75mm