Neuo, unless you're doing custom pieces why not go for the casting route?
You can create a rubber mold for far less initial investment costs than 3D printing, plus a faster cycle time and much smoother detail fit for your design.
Use a wooden master model that you can even make by hand.
You will need a positive mold piece as well. And for hollowing out I am thinking CNC'd foam inserts that you suspend in the mold.