Proteins for P3Steel 3D printer

This version of P3Steel has been developed in the Grenoble hackerspace LOG. For more information see https://www.logre.eu/wiki/Prusa_P3-Steel
The part P3S_spool_roller.STL has been adapted from a model provided by fma38.
The feets have been printed for the first 3.5mm layers from FilaFLex, and for the remaining layers from standard rigid PLA.