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3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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You can only keep so much hardware before it just becomes disorganized. I have a variety of screws and nuts from M2 up to about M6, as well as some Imperial sizes as well. A few different lengths.
I usually don't bother with threaded inserts too much and instead just tap the plastic itself. Obviously it depends on what the part is being used for.
The reality is that it shouldn't be a surprise what hardware you need after the print is done because 95% of the stuff I print is stuff that I design myself, so if I know I have 1/4-20 screws that are 1/2" long, then that's what I will design the part for so I'll have them ready to go when the print is done.
I'm always torn between metric and imperial hardware because inch sized screws are cheaper and easier to get locally (Home Depot, etc), but metric and imperial are basically equally easy if I get it from Amazon. Then there's McMaster with the biggest selection but it's spendy.