>>10892682Are you so retarded that you just didn't look at the thread at all?
>>10891977You'll have to learn how your software handles files (your modeling program, your slicer, any software you need to use to clean up broken geometry), but yeah you can work in mm, inches, etc in blender. Usually if scale is wrong when moving from modeling to slicing, it's wrong in a very obvious way (like being 10/100 times smaller/larger and you'll be able to tell that kind of thing before printing.
For stuff like sockets for joints, tolerances can be pretty low. If you're using a standard set of joints, you can create an object that represents the shape of the hole you need to cut into any object to accept that joint, And then use Boolean operations to cut the joint space out of the object. That's how I've always handled it. Basically, you do some trial and error to get your joint reference shape perfect for a given joint (I used hobbybase and revoltech joints) And then you can more or less use that same shape to cut holes for joints in future pieces.
Until you've really gotten used to your tools, expect a cycle of model, print, test fit, adjust, print etc. If you're planning on using an FDM printer, you'll probably need to also account for how the joint socket is oriented relative to the bed.
Pic related: some shots from when I was printing up test parts to see how joints fit together.
