Here is just about all the parts you need to build your own Kossel Mini. Included are frame pieces, end stop brackets, carriages, effector, and some accessories I think are needed like fan brackets and shroud. Some of the items tell you how many to print i,e. 1x 3x in the file name. All non essential items have optional in the name so you don't go and print a lot of stuff you may not want. The frame is made of 15mm x 15mm (1515) extruded aluminum from Open Beam or Mitsumi http://us.misumi-ec.com/vona2/detail/110300465870/?KWSearch=HFS3-1515&catalogType=00000034877 I have many blog posts and videos detailing the Kossel Mini build process http://www.electronhacks.com/category/electronics/3dprinting/ View the thing instructions by clicking the tab above for more info...The core Kossel Mini filees are fairly stable but If you want access to the original .stl files from Johann he has them up on GitHub https://github.com/jcrocholl/kossel I have some other Kossel accessories you should consider like the Filament Spool Holder http://www.thingiverse.com/thing:259003 and RAMPS board enclosure http://www.thingiverse.com/thing:258797 You can use just about any extruder, in my opinion if using a direct drive extruder like the one included or Airtripper's http://www.thingiverse.com/thing:22426 you will need a gear reduced stepper motor to get enough torque. If you want to use a regular stepper I suggest something like Greg's Accessible Extruder http://www.thingiverse.com/thing:183277 even though the MakerFarm kit was for 3mm it works great for 1.75mm Some other resources I used while building the Kossel Mini. http://reprap.org/wiki/Kossel and http://www.builda3dprinter.eu/