We recently got a 3 printer. Yay -- new toy! We're learning how to design with it, but we're not very good yet. I can make simple shapes merged and such, hubby even less -- but mostly, we're printing things we find elsewhere that fill a need we've come across.
One thing I've needed for my car is a way to have the seatbelt sit lower. Even on the lowest setting, it still cuts uncomfortably across my neck when my seat is in an otherwise comfortable driving position. We had one of those clips that attaches the shoulder belt to the lap belt, but it was kind of a pain because hubby doesn't need the same adjustment -- so we were constantly sliding it around to fit when we switched off, and it was next to impossible to take off and put back on.
Which brings me to something I want to print, which would hook to the bars the hold the headrest on and follow the "shoulder" of the seat, and just be a spot where the belt could slip into it, but also come out easily, so it wouldn't be a problem in an accident. Basically, something like this one for the BMW, but possibly coming a bit farther over the "shoulder" of the seat: https://www.bmwpartswholesale.com/oem-parts/bmw-seat-belt-holder-5230220...
I'm not an artist. I have a vague sketch of this at home, but no idea how to turn it into a functional printable item. Does anyone have better skills than I do that could either make the design or give me tips to do it myself? We're currently using TinkerCAD, though we aren't opposed to buying a program. We just want to make sure when we drop $$ on it, it covers all of our needs, which so far, we don't know what they are to determine what's best.