I saw that there was another instructable on how to make one of these. But requires more materials, time, and is "for girls " according to my boyfriend. We had the mouse pads with the wrist-rests already on them; but the memory foam wore out really fast and we realized it would be more cost efficient to create our own using a different filler material, and make it last longer.
Step 1: Step 1: Finding the length measurement
I used the four layers for extra protection for losing popcorn kernels, and the added comfort/cushion. You may use more or less layers depending on the type of material you are using. I used a rayon/cotton blend because it stretches easily.
Step 2: Step 2: Finding the Width measurement
Step 3: Step 3: Measuring the top length
To add the extra space you measure up an extra 1.5 inches from the middle of the length measurement (this will be the highest point on the top length). Since the width is 3 inches, adding an additional 1.5 inches meant I drew a dot at the 4.5 inch mark from the middle (5 in. mark) of the bottom length line.
Then connect the dot at the 4.5 inch mark to the two width lines to finish creating the pattern of your wrist-rest.
Step 4: Step 4: Cutting out the pieces
I suggest using a circular blade or razor blade to cut out the fabric pieces. If you use scissors be careful because the pieces may come out being different sizes, which may make sewing more difficult.
Step 5: Step 5: Sewing the Pieces Together
Hold your four pieces of fabric together along the bottom length side, making the pieces line up together to create a straight edge.
Put your fabric pieces under your sewing machine foot. Put the material under the foot leaving about a 1-1.5 inch space between where you will be sewing and the edge of the material. This is to make sure that you will get all of the pieces sewn together and not have any missed spots where popcorn could fall out.
Also, make sure to leave about an inch of material behind the foot of your machine so the material will not get stuck under the foot and you can push the material through while sewing.
Sew around three sides of the material. Do not sew to the end of each side! Instead sew until there is approximately an inch before the edge and then, with the needle down, lift up the foot and turn your material. Put the foot back down and then sew the next side.
When you get to the last side to be sewn, sew along the edge and stop about half way through the side. If you started sewing on a length side you should be on a width side, so sew about 1.5-2 inches down the side and then stop. You need this open space to put the popcorn into.
Step 6: Step 6: Flipping the Material inside out
Push the fabric through the opening of your half sewn side until it is flipped inside out. Make sure to push the corners out with your finger or a dull tipped object.
Step 7: Step 7: Filling the Fabric with Popcorn
Using a funnel, or some other instrument, fill the popcorn into the fabric until it is full, but not over filled.
To know when it is filled enough hold the end shut and then try to move the popcorn around in the fabric. If you cannot move the popcorn then it is too full and you need to take some out, but you should not be able to push the popcorn and feel the bottom either. A perfect fill is to be able to press on the bag and your finger goes down about a quarter to half an inch into the fabric.
Step 8: Step 8: Sewing the final seam
Fold the layers of material over with the ends facing into the popcorn. Make sure all the layers are folded over so make a strong and supported seam.
Start by putting the needle into the fabric where it had already been sewn together earlier. This way you will have no gap between the two sewn areas. Sew from one side of the fabric through to the other side and then back. You may chose to use a different sewing stitch, use whatever stitch you are comfortable with.