Main image courtesy of Sarah.
Step 1: Go get stuff
A 16" x 16" sheet of 1/8" acrylic (this leaves a little room for margins/scrap)
A heat gun
Two table clamps
Some plywood scrap
A laser cutter
(if you don't have a laser cutter, you can download the file in the next step and have a service like Ponoko cut it for you.)
Step 2: Prepare to cut
Download the file attached below and open it in Corel Draw.
Step 3: Cut
Cut type: Vector
To start cutting my material, I simply hit the green button on the machine and then babysit the machine for twenty minutes while it does its thing.
Step 4: Poke
Step 5: Clamp, measure and bend
Heat up the 1" strip of acrylic with your heat gun, by moving it back and forth along its surface until it visibly starts to droop. The acrylic is now very hot. Put on your oven mitts and bend the acrylic down towards the floor to a 90 degree angle and hold it in place until it starts to cool and maintain this shape on its own. Let go and wait a few more minutes for it to cool more.
Step 6: Second bend
Step 7: Fix mistakes
My 1" fold came out very crooked. To fix it, I just re-heated it and clamped it under even pressure two times. This got it to a reasonable state. If I did it a few more times, it would probably have been even better.