Simple take on the flint and steel item from Minecraft- make sure to keep an eye on the scale you set it to. I'm very new to 3D models but I made this one on Tinkercad and got it to print no problem- please let me know if there's any way I can make this easier to use.

For scale (if you want the pieces to be easier to hold), I'd say your best bet is to set the width of the whole project to about 6 inches wide, although if your hands run on the small side I'd scale this down an inch or two.

If you wanna use this as a base to remix your own model, that's fine by me. Go ham!