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 Opecad and run the script he provides, and have it your way. Most of the desig 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 dillo' 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 folde 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.