The Prusa 3D printer is the simplified version of the Mendel 3D printer from the www.reprap.org community.
You can find much information about this printer on this link.

For the Prusa 3D Printer you need the following parts:

• Casted Prusa parts with Wades extruder
• Prusa bars and studdings set
• Prusa nuts and bolts set
• Prusa bearings set
• Prusa timingbelts set
• Prusa printbed set
• 5 Nema17 steppermotors
• Wades extruder screw set
• RAMPS 1.4 electronics set
• RAMPS 1.4 wiring set
• ATX power supply
• A hotend: either a arcol.hu 4.0 or a J-head hotend

And if you want to make an improved Prusa 3D printer with linear bearings you might want to add a LM8UU Deluxe upgrade kit.

Also recommended: a heated print bed kit

For building up the Prusa 3D printer, you can take a look at the following page