Take the old roller blind, Fit it in your window following the manufacturer’s instructions. Remove the fabric from the roller blind, and remove the dowel or plastic bar from the bottom of the blind, and set it aside (you’ll use it later).
Measure the roller bar from the end to end, just inside the caps on each end. Add 2.5 cm to this length for measurement A.
Also measure the distance from the roller bar to the spot where you would like the blind to fall, and add 23 cm to this length for measurement B.
Cut a piece of fabric that’s as wide as A and long as B. Make sure the fabric is straight use a rotary cutter, cutting mat, and straight edge for this job, if you don’t have these, you can use an Lsquare or a yard stick to mark straight lines.
Make the first cut along the selvedge edge, then measure from that line to make the remaining cuts, being careful to cut right angles so tha all edges will be straight.
Turn under the long side edges 1 cm and press. Sew along the side seams, stitching close to the folded-under raw edge.
Turn under the bottom edge 1 cm and press, then turn it under another 4 cm and press again. Stich in place, sewing close to the interior fold. The sides of the Hem will be open, creating a sleeve for the dowel at the bottom of the blind.
You can add trims to embellish your blind to make it extra special. Using a glue gun. Add the trim of your choice to the bottom of the blind. A great option for a roller blind is beaded trim.
To attach the fabric blind to the roller, apply a couple of strips of double-sided tape then place the fabric right-side up on a work surface. Make sure the roller is aligned perfectly straight at the top edge of the fabric, so the fabric rolls evenly, the roll the fabric onto the roller.
Pop your blind back into the hardware you installed earlier. Insert the dowel in the end pocket, and you’re done!