The WarFairy P-15 is a 3D printed Fabrique Nationale P90 stock[1][2][3] made public around May 2013.
[1] It was printed using a LulzBot Taz printer[4] via the fused deposition modeling (FDM) method.
[5] It was created by WarFairy[2][3] The stock works a lower receiver for the FN-P90 but would work with any standard AR.
[4] It is an offspring of the Charon open source project,[6] which was a 3D-printable AR-15 lower receiver project that was partially inspired by the P90.
It began as a design exercise by a DEFCAD user to explore FDM additive manufacturing technology as a means of integrating the P90's ergonomics into a stock for the AR-15, resulting in the WarFairy P-15 stock set.