DIY 3D printing in metal is a lot more complicated ... And once you’ve got all that down, getting a good pattern down for 2D infill in metal is non-trivial. A sweet half-scale metal Benchy ...

3D printing was invented in the late 1980s ... The bottom layers are simply solid, the middle layers have a perimeter and an infill pattern, and the top layers are just solid again.

By using 3D printing a saddle company can get even more precise so that the saddle is only as dense as it needs to be in every specific part. Creating this precision is the job of the infill design.