So here is what I am going to do (and I am soooo wide open to input on it.)
So after a bit of internal debate and taking into account what I have learned here on the forums and from googling I am going to stay with the cheap stuff for shop projects like tool holders and such that are one piece and do not require tight tolerances- I have never had a problem with these types of things yet.
However, I have been working on a radio control airplane project that has a 60 inch X 17 inch wing and a 60 inch long body (fuselage) So lots of filament and lots of smaller pieces to build up and fit together to make the final finished 5 foot by 5 foot project.
I had originally built in .2 mm tolerance e.g “tab a” was 2mm and “slot B” was 2.2 mm and I could almost never fit the parts together! For example, tab A would come out 2.17 and slot b would come out 1.87.
Thanks to the several factors noted above I get how that happens now.
So for smaller things I have and will continue to use “good” (i.e. expensive) filament. However, for this large project I am sticking with the $8 a roll stuff as the only problem I have had with it is dimensional accuracy (fractions of a MM). Otherwise it prints up very well! Well, that and I don’t want to drop $100+ of filament into the airplane print then just go crash it! ! Lol
However, I am redoing the airplane parts to use .5 mm tolerances AND I am getting rids of tabs and slots totally. I will use faying surface glue joints instead. Not as elegant but far more practical.
Thanks to everyone with all the input so far! And hey, don’t stop the thread just because I decided to stick with the cheap stuff on BIG projects! lol