Step 1: Materials and Tools
A terra-cotta chimney tile or anything similar. I found some large flat pieces from another broken section that I thought I could use for bottoms also.
Two component epoxy
Angle grinder with a wet/dry diamond blade. You could also use a masonry abrasive blade on the angle grinder, or use a wet tile saw to make the cuts. Make sure you use safety glasses and dusk mask if using a dry blade.
Step 2: Mark and Cut
Secure the tile in place and begin making cuts with the angle grinder. Make sure you position this so that when the cut is complete the tile doesn't fall to the ground.
Step 3: Make the Bottoms
I used some broken piece of another section of chimney tile for the bottoms. I put a section of the tile against the scrap piece and traced an outline of the inside of the chimney tile.
Secure the piece of terra cotta and cut out the shape of the bottom with the angle grinder. I had to keep grinding these down to get them to fit. You can probably get a better fit up if you are more patient than I am.
I also used the angle grinder to cut a notch in one side of the bottom to act as a drain hole for the pot. Alternatively, if you have a carbide drill bit, you could drill a hole in the middle of the piece.
If you don't have terra cotta pieces to make the bottom out of, you could really make this out of about anything water proof since you won't really see it after the pot is completed.
Step 4: Assemble the Pot
Make sure the terra cotta is free of dust from the cutting process before assembling. I dusted mine off with an air compressor.
I put some waxed paper under these so any glue that seeps out will not adhere the pot to the work surface.
I used two component epoxy to secure the bottom. Apply the epoxy to both surfaces at the joint and pack the epoxy into any gaps. Don't plug up the drain hole if you added one like mine.
Step 5: Finished!
Let the epoxy cure the recommended time and add your favorite plant.