This 1:87 HO Scale file represents what is called a 'Stoneslinger', which is basically a dump truck that can discharge a load over a wide area quickly, placing it precisely where the operator wants it to go. The piece is designed so that the conveyor chute can swing from the stored position to right off the back, and can swing in an arc. The conveyor also raises and lowes to some degree. I have included the main larger pins that one would need, but I strongly recommend the smaller ones at least are replaced with either wire, brass rod, or styrene for the additional strength. I have not included the two smallest pins, the ones that secure the hydraulics in place, as the size is too small and delicate to print or use. There is a ton of detail in this, so I'm offering it in the Frosted Detail material (Or FXD) only. It has passed the software checks, but if there's an issue, contact me via the shapeways designer link, or direct via Email to modelmechanic@gmail.com