It’s hard to be an expert at everything, but this collection of wood joinery techniques will make your next project look like you’ve just finished your degree in mechanical engineering. They’re targeted for use in projects where thin sheets of plywood are CNC cut to make enclosures and parts. [Sean Ragan] mentions that these are not new, but we haven’t come across such a large collection of examples as this.

The joints shown above address a series of different needs. You’re probably already familiar with the joint on the bottom right which makes nice corners for a box, providing a lot of surface area for gluing. But just above that is a simple variation on the idea which includes slots for square nuts. This type of mechanical fastener brings strength while keeping the option to take the joint apart again

To the top left you can see a design that includes a snap lock. As the two pieces are slotted together, the barbs flex until they find their mating openings and hold the pieces firmly together. Below that are some bulbed finger joints which don’t need glue to hold themselves together.

[Sean’s] post goes on and on with these designs. He even covers the laser-cut bendable hinges which we are quite fond of.