Super easy finger joints!  It looks "rustic" because it's all scrap pieces.  I literally pulled them from the scrap bin and used them as-is, apart from cutting to length.

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Can be done for bigger "box joints" too but I'd have to make another crosscut sled for use with my dado set.

Jig is just a flat board with a pin the width of the blade glued into it and set one blade width away from the blade.

I just made a box cutting jig sled today. I use cutting boards for rails as they don't extract or expand as much as wood but I noticed I need to cut them a bit thinner because they lift the entire sled off the table about 1/16".  It wasn't a big deal on my cross cut sled as it's supported on both the front and back.  I didn't put a back fence on this one though and you can see the bottom is sagging.  I will fix it next weekend when I build my first box.

Plastic rails works good.  I used maple because I had some scrap pieces.   The maple has held up well.

Definitely cut them slightly below flush of the t-slot depth so they don't bottom out before the sled is on the table.

Biggest problem I have with them is my t-slots aren't very consistent on this griz tablesaw.  Had to try to sand out some of the tight spots by hand.

This guy has a super cool jig that you can make and use templates for so it's dummy proof, and you could use a regular blade and not a dado too (if you wanted). The lifting jigholder and partholder is a really cool idea.

I've wanted to pick up an incra I box for a long while. I just keep putting it off.

Literally my first and "go-to" jig.  It almost never leaves the saw as it is so versatile and usefull.

My table saw is a small jobsite saw and the miter that came with it is all but useless.
A crosscut sled is first thing I built with the saw, now I can't image being without it.

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