How to create interlocking parts of a pentagon for 3D printing?

[cyangaze]

I'm trying to design a way to have this frame (in the shape of a pentagon) have interlocking parts that can be 3D printed and glued together. I've tried various sketches with extrusions but I think it's been done in a non-methodical way that could be done much better.

Here's the 5 parts all together:

For this part, I tried to extrude the locking piece by sketching on the top. However, I can't figure out how to make it thinner to slot into the next part:

For this body, I managed to extrude a slot, but the lip is stuck in body 2, when it should be in body 1. I suppose there could be a way to join the lip to body 1 in the patch workspace, but I still think I'm doing this really wrong:

Is there a better way to do this? I'm really at a loss.  Thanks so much.

[etfrench]

Here's one way to do it:

[mango.freund]

Hello - reinforced with tap.                  greetings mango

[TheCADWhisperer · Accepted solution]

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@cyangaze wrote:

Here's the 5 parts all together:

Is there a better way to do this? I'm really at a loss.  Thanks so much.

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Actually, you have 5 instances of 1 component.

See Attached.

No Planes, one simple sketch.

[cyangaze]

Oh I see that's a great and simple way to interlock the parts! Thanks

[cyangaze]

Interesting option! I like the button-type slot. 

[cyangaze]

Wow this was exactly the solution I had in mind. Well done with the circular pattern and component repetition. I now see the workflow in this example (as well as the other responses) in the extrusions and with one sketch. This was what I was thinking, but of course the other examples also worked well. Thanks again!