3d printed sex toy concept

So i've seen a number of photos and videos of guys fucking themselves in the ass, it looks hella-fun. I've attempted it numerous times, but can't quite get the head in. Once i barely managed to get minimal penetration, but it's difficult. I've also seen a photo of a guy with his balls in his ass, looked really hot.

After a bit of thought, I've come up with a design concept for the anal equivalent of a shoehorn, but i can't afford a 3d printer to test the idea. I'm completely broke right now, just spent a couple of thousand bucks getting my vehicle repaired. I don't know much about 3d printers, but a quick amazon search gave me the impression i'll need to spend at least $300 on one.

Anybody wanna throw in on helping me get a 3d printer? I promise I'll post lots of videos of me fucking myself in the ass. ;) I'm still trying to decide on a name for the toy, maybe AssOpener or ButtStretcher? I intend to make the source file freely available for anyone to download and use, maybe even with a couple of design variants after I get some use and figure out how to improve the original idea.