• Build volume: 8x8x16 inches or 200x200x400 mm
• Footprint: 12x12 inches
• Print surface: 8x8 inches heated glass which never moves
• Mass of moving platform with hotend: less than 100 g
• Mass of moving platform with two hotends: less than 150g
• Positioning speed: 800 mm/s in all 3 directions
• Positioning accuracy: 100 steps/mm in all 3 directions
• Simplicity: fewer than 200 parts (not including washers, nuts and SMD-mounted electronics)
• Hardware cost: less than $500 USD

• Stepper motors: 4x NEMA 17 (plus extruder motors)
• Timing belt: High-torque GT2 belt (2 mm pitch)
• Pulleys: 12 groove aluminum (7.6 mm pitch diameter)
• Filament drive(s): similar to Ultimaker
• Ball bearings: 8x 608 (skateboard bearings)
• Linear bearings: 8x LM8UU
• Smooth rod: 8x 762x8 mm
• Diagonal rods: hollow carbon fiber rods from kite shop
• Diagonal rod ends: cheap ball joints used for model race cars
• Hotend(s): MakerGear 1.75 mm
• Top and bottom frame: laser-cut plywood

Search YouTube for "flexpicker" or "adept quattro".

http://heliumfrog.net63.net/deltarobot/delta.html