With 3D printing as prevalent as it is, I would think it would be no big deal to make these. The only real hold up would be making the 3D file.
@Wreck-n-Crew
If you have a 3D printer and can print with the right materials they would probably go for About $6 a piece of you were selling them. Kind of cost prohibitive considering what you make vs what it can do too.
IMO nylon would be the best material as it is semipliable and very impact resistant.
The most common 3d print materials like PlA, PETG, and ABS all have different shortcomings.
PLA is strong and stiff but can warp in a hot car and is not chemical resistant.
PETG is not quite as strong as PLA, a little more pliable, a little more heat resistant and it is chemical resistant.
ABS is weaker than both but is more heat resistant and not chemical resistant at All.
Nylon is stronger and more pliable, more heat resistant, and much more impact resistant than the above. But it's harder to print without warping and coming off the bed. You have to have a high temp hotend to be able to print with it and an enclosure is best.
There are also flixibles like TPU but you don't want them for something like that as they are too pliable.
There is also polycarbonate which is hard to print but pretty strong. Just not stronger than nylon but stiffer.
There are more filaments but they get expensive. Especially the Carbon fiber filled or glass filled filaments. The only thing they are good in is Nylon IMHO. When mixed right with nylon they make it stiffer and stronger. When the blend or percentage of carbon fiber is too much it makes Nylon less impact resistant and even brittle like glass.
Making a 3d file wouldn't be too hard for an experienced or semi-experirnced user. But there are at least 12 ( might be many more) different styles for free on many of the STL websites.
Personally I would just buy MTM case guard ammo boxes over printing them.
3d printing is evolving fast. Back when I got my printer it was a bunch of parts and I had to build it and wire it up. At that time many kits were much easier and we're mostly assembled but I wanted to know how they work and thought that would be the better way to learn. Lol
I have since then build a custom 3d printer from the ground up including compiling and installing software for it.
Now they have 3d printers that use a liquid resin. hey also have 3d printers for making metal parts. But those get expensive.
Sorry for so much info but I thought I would share some knowledge while I was here for anyone interested in 3d printing.