Pretty much everything i design, i make in NX cad-software, and i usually make things easily adjustable (but not allways). Meaning that I can often easily create new versions of things :-)
Oct 2017. I now have an "old" Ultimaker 2+ in my office, we have around 10 Prusa MK3 in our student 3d-printing lab as well as a few others lying around. I'm luckier than most :-)
June/July 2012, I was lucky enough to get a BFB 3D Touch with two extruders at my workplace, and currently in my office.
I'm still in the process of figuring it out, printing as many fun/useful things i can. Both successfully and not so successfully :-)
And just recently I came across the Thingiverse, which is awesome.