3D printing noob here. I've been looking at some of the other threads for recommendations and currently weighing up whether or not to go new or used for my first 3d printer. I was just wodnering what maintenance is like on these things? I understand that like any other printer you will need printing materials (in this case filament/resin) but what else is there? I want to get an idea of the overall running costs (as well as the startup costs) to be able to make an informed decision here. Are there parts that need replacing if they go wrong?