This is a replacement “Drop Tube” for the RCBS powder hopper that came with my Rock Chucker Reloading Press, which I purchased in the late 90's.  I haven't been able to locate this as a replacement part on the RCBS website, and this one just costs a few cents to print.

I have tested the threads on my powder measurer, and it screws in flawlessly.  If this is a part that you've lost or broken (the plastic RCBS used for this kinda sucks) then feel free to download and print one for yourself.  I've tested it in both PLA and PETG, and both print well on my Prusa MK4, with 1.5mm layer height.

There are two model files; one is the Large size, and one is the Small size, which corresponds to the size of the bottom hole that the powder comes out of.  I modeled these after the actual diameters from the large and small sized tube that came with my reloading set. If you want to adjust the size of the output hole yourself for something custom, open the f3d file in Fusion360, and find the sketch labeled “small hole.”  This sketch contains a single circle.  Change the diameter of that circle to however large or small you want the hole to be.

I hope someone finds this useful.

Printables Tags: powder; drop; reloading; replacement; rcbs; tube