02/11/18: Added support for 45 caliber drop spring (Bullet Drop Switch Unit and Spring Housing). Probably will work with 10mm but have not tried. Pipe bending springs mouth openings and overall length do very by manufacturer, see picture.
A combination of parts that support the excellent Bullet Feeder Design by AmmoMike83.
If you think his design is to small or even too big for your needs, download OpenScad and run the script he provides, and have it your way.
Most of the designs here are my own, though the main body design that is just a minor remix to suite my needs.
Be certain you find the note for the part you plan on printing, read that, as I'll note any problems I had with that part.
On a Dillon XL650 with case feeder hopper and dillons' primer feeder, I can load 600 rounds per 65 to 70 minutes. Thats real world with occasional upside down case, misfeed ect (not running it like a madman...). More than 5000 rounds, yes it works.
I've used the Mr. Bullet feeder bullet drop die (9mm), perfect function.
I could not upload my files in folders so this is kind of slammed - Sorry. I had related parts in an individual folder, generally with a text note explaining what I did, you might want to do this. As you would expect, a V3 part was an improvement over V2, etc.
Usually 0.2mm prints are just fine on small parts, 0.3mm works just fine for large parts at a fast print speed of 120mm/s. Everything is PLA. 0.1mm resolution on the anchor, meant less filing, small parts were generally printed at 60mm/s.
Faster prints speed really heat up the steppers and internals, I went to quiet fans then realized this, and put in better cooling fans and did mods for airflow.
Netfabb - was used to add some area on the main body, very minor remix. This application is fairly intuitive for working and modifying solids.
FreeCad - Everything else was done with this software. Not at all intuitive but quite powerful if you can figure out how to trick it into doing what you want. Basically you add or delete shapes together but they are never lost (unless you delete them) and can be re-edited by entering dimensional changes. If you import a solid into this software you have to convince the software that it is a solid, generally making it a mesh then convert to solid; good luck, sometimes it takes and other times, well try again... Useful, basic support is non-existent.