Layer One, creators of Atom3D printer, have released two open source RepRap 3d printer. Proton and Neutron. They are open sourced under Creative Commons licence.
Proton has total volume of 38 cm x 28 cm x 37 cm, assembled weight of 4.25 kg and printing volume of 18 cm x 18 cm x 15 cm.
Proton assembly video:
Proton Thingiverse page:
Neutron is a delta configuration 3d printer. It has total volume of 32 cm x 33 cm x 54 cm, weight of 3.75 kg and printing volume of Ø14 cm x 20 cm.
Neutron Thingiverse page:
You can also find both 3d printers on MyMiniFactory Atom3D page:
Full details on both printers can be found at company webpage: