In our last hangout (and in many other places I'm sure) we were discussing Design for Manufacturability and I brought up that FDM printers don't product dimensionally accurate printouts. Essentially, holes are smaller by what I believe to be the diameter of the nozzle you are using, so you'd increase your dimensions for holes and internal cutouts (and also decrease your outside profile if you need to snap fit multiple parts together) for a more accurate printout. That said, I just switched my E3D hotend over from a 0.4mm to 0.6mm nozzle and now need to recreate many of my models. So, I'm trying something new in how I do a design. Inventor is a parametric utility, which means you get a history tree. You can go back to earlier and make a change and it will be reflected in all the commands you did after that. So, I immediately make a paramter (variable) called tol (for tolerance) and set it to the diameter of the nozzle. Then for every feature that requires it, I will add tol to it's diameter/ measurement. Thus, when I switch between printers/ different nozzle sizes, I just have to change 1 thing and the model will regenerate. Similarly, if I find that the current tolerance of 0.6 is too much, I can just decrease that and test until I come up with a working figure.

Hypothetically, if I then wanted to injection mold a part, I could just set tol to 0 and send it off.