Here is a few pics showing how I do the hexagons. The first pic shows the muslin backing that I have drawn the hex outline on it. Next I draw the piecing lines with very light pencil so they will not show threw in case a fabric colour is light. Next I turn it over and redraw the outline only on the back of the muslin. This line is for sewing down when all the block is pieced.
Right side of muslin
Wrong side of muslin.
Next I piece the block with my fabrics. After this I pin the fabrics then turn it to the wrong side and stitch all around the line I have drawn. Then I stitch again about 3/8" inside that line and you will end up with the back looking like this.
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When all the sewing is finished you will have a hex all ready for stitching and embellishing. You will note that I leave a very small margin of muslin but that is because I never cq in a hoop so extra fabric is not necessary. If you use a hoop you will have to leave additional for this.
When embellishing is all finished cut away the muslin and extra fabric as close to the outer black stitching line as possible. It will now be ready to add the batting and backing fabric of your choice. I am using black cotton sateen even though very little will show.
The reason for the inner sewing line is for when you will be adding the backing that will turn over. It will be 1" larger all around then your cutout. You will turn it 1/2" then 1/2" over the hex nd it will just cover the black stitching and will not be seen. If you are using light fabrics you will want to use a light color thread that will not show threw your binding.
I have made up about 25 squares so far and here is a pic of a few ready to stitch on.