Calculating the strength of 3D prints can be a tricky thing to do, and is especially important when you consider your “what”. Listener, Lars Ahlstedt from Sweden, wrote in asking how to do just that with calculating the strength of a 3D printed bicycle, not just for fun but for one of Sweden longest bicycle races. Answering this question and considering the liability of selling a file that potentially be misprinted - who’s at fault, the seller, the buyer/maker, or the 3D printer manufacturer?