For most people this is just fine - your goals were not to build a 3d printer it was to build something that just happens to be build able on a 3d printer. That is the something you are building is the goal, not building a 3d printer. If the goal isn't building a 3d printer then buying a 3d printer that someone else has already debugged and made to work is the better way to get to what you really want to do in the first place.

In a way this is good. 3d printing is neat, but it got too much hype which was taken away from other useful things makers should also have experience in. More makers should think of injection molding when doing plastic parts. Many plastic parts makers are making would be better as metal done on lathes and milling machines (or if you want to have fun shapers and planers - both obsolete but still a lot of fun if time/money isn't important). Wood working has never really lost popularity, but it should be mentioned as a good option for makers. There are also cloth options - sew, knit, spin, tat (my favorite). There are plenty of other ways to build something other than 3d print.

Finally along those lines, for some just drawing something up in CAD and sending it off to someone else to make is a good option. FreeCAD has come a long way finally has reached 1.0, or you can pay for one of the commercial options - some of them are reasonable for makers though read the fine print.