Athearn 34 ft Hopper Load

This is a load for a [34ft Athearn hopper car](https://hoseeker.net/athearninstructionscars1970/34hopper1973.jpg). The 3D-printed part can be used as-is, or weights and scale-coal (or other material) can be added.

The part includes two mounds. These are intended to make the load look more realistic/add character, whether or not the load is covered in scale material.

Two different STL files are provided. One has just the final part (in which case supports will likely need to be generated during slicing. The other STL file includes six extra volumes that can be used to support the part when printed standing on one of the short edges (see pictures).

The part can accommodate [self-adhesive tire weights](https://www.amazon.com/dp/B07PPPVB24?ref=ppx_pop_dt_b_product_details&th=1), which will increase the weight of the hopper to NMRA spec. The weights are placed on a "fin" below the load in order to put the lower in the body of the car.

There are two notches in the load so that it