I understand that your prices are reasonable... In comparison to others... I have made a hidden blade out of scrap metal, and some of the mechanism was 3d printed plastic, but I did it for 20$, and sold it for 50$. I think that's fairly reasonable. I did the research, drew it up on CAD, and hand forged the scrap metal. A 3d print requires the research, and the time it takes to draw on TinkerCad, or Autocad 15, but $135.00!!! That's a major investment. Nevertheless, I love your designs, and like your Connor blade, but you should try to install a spring on it so that it will snap back from the dagger position without a wrist flick.