That was me. I am happy and surprised to see how much success you had with this--you seemed like you were quite far over your head. I'm glad I was wrong.
I'm pretty sure we never said we'd print any design, as we don't have the sort of printer that does that (SLS printers can do most anything, we have FDM printers because we are poor). And looking at your parts, I'm pretty sure we couldn't have printed them without a redesign even if we did have 3d model files for them.
I'd mostly forgotten about this, and I am sort of working on something a bit similar (Not ultiple-more, but using a pulley or a gear like the 2nd style you showed) but right now I'm re-inventing magazines to that end. I'm glad you posted this before I put out anything as I wouldn't want to steal your thunder. Making something like this with the help of a 3d printer would be impressive, but out of machined PVC pipes and fittings like this shows incredible skill, craftmanship and careful planning.
One question about functionality--You seem to be the only person on earth other than me that makes nerf breeches that push darts past the air source into the barrel. In the blasters I've made like that, I've been able to repeat the loading/priming motion to put multiple darts in the barrel and fire shotgun style. Does anything prevent you from doing that with your blaster?
Sorry for the misunderstanding, I didn't mean literally "any design". I just thought you might be able to help but I do understand the limitations with printing.
Thank you for liking my design. It took a ton of time, reworking and refitting and crying.
I'm excited to see what you have in the works.
Yes, you can repeatedly cock the pistol to load multiple darts, at least with the current design. Or you could hold the trigger while cocking and it would fire immediately as the slide returns forward.