
Here’s my technique: BEFORE I sew my first two squares together, I mark the square that will be cut on it’s back side, drawing a line 1/4″ from the edges and then two diagonal lines from each corner, like below:

Using a rotary cutter and ruler, I cut on my diagonal lines starting and stopping a “scissor snip” length from the corners (about one inch), like so:

Then, I sew my two squares right sides together all around the edges. Doing it this way requires only one short snip to be made before folding out the edges. Less chance to accidentally cut through the front square or cut wonky, longer lines.



For every additional “layer” I add, I cut this same way first, before sewing it face down to my other pieces and folding out. If you decide to make blocks using the “exploding” technique I hope my cutting tip helps you out!

https://beyondsockmonkeys.com/tutorials-2/exploding-block-tutorial/