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There are a ton of ways to do it depending on what you're after. Get creative what 3D printing opens up too, quirks and all. I've had good luck designing some joints like this which are very slightly tapered. That way when they press fit in a clamp, the layer lines actually lock them together and no glue is needed. This particular design also looks really clean on the 3 visible sides if you care about that.

I took a quick look at your model, and have some thoughts.

• I wouldn't bother shelling it out for 3D printing. Just adjust the number of walls and infill % to get it hollow. That gives you a nice thick areas around whatever joints you design.
• In your case, you might consider creating negative dovetails (or something dovetail inspired) on the parts, and printing a separate dovetail bowtie part to press in like these. If you do a slight (like 0.5 - 1 degree) taper, you might be able to get a good strong joint with no glue.

It would be cool to see some custom features to automate this kind of thing.

thanks, romeograham

it's a solution and both view and notes are in the same sheet.

Currently, I mark these notes dimension in same view because it's good for update and management.