Printer settings: Ultimaker 2+ Filament = 14m Layer thickness = 0.15mm with 0.4mm nozzle In fill = 100% solid (for strength but there are modelled in hollow sections where acceptable) Speed = 40mm/s Support = everywhere (there is also an additional support modelled in, that supports the generated supports!) Adhesion = Raft I have used the following filament types. ColorFabb PLA/PHA at 215C/60C Rigid.Ink PLA Plus at 225C/60C Real Filament PETG at 240C/80C The PETG is the strongest but the latest version has survived in the PLA derivatives. Attribution: Parts of the model have been derived from others. With kind thanks to the authors of the following: Skull - http://www.thingiverse.com/thing:179795 Other Bones - http://www.thingiverse.com/thing:157696