Well all ideas that users told you are a good way to start. You already have the knives? Those are mesh 3d models made by external software like Blender? Or the knives are Roblox Parts? I would go with this approach: 1.- Create some knives using blender 2.- Create UV maps and text...
The best way to learn 3D printing is to first familiarize yourself with the process, how printers work, and their parts and capabilities, along with safety guidelines and precuations. From there, think about the "why" and what 3D printers could be used for on a small and large scale. Of...