Yep, i do have a filament printer (Bowden, so no TPU for me, yet), and i mostly do functional parts of any kind.
This thing has saved me a ton of money already and made me even learn 3D modeling using 3D Builder (the easy route) and FreeCAD (mainly for threaded stuff and parts based on advanced geometry). Some of you might know FreeCAD, it's a bit of a pain in the ass to use, but delivers perfect results if you do it the "FreeCAD way" from start to finish.