Deciphering the markings
The packaging didn't do a great job of pointing out what all those red lines really mean, so we did this handy little guide for you. As I mentioned above, you get 1/8" and 1/4" seam allowance guides and needle drop/cornering guides both 1/8" and 1/4" in front of and behind the needle drop.
The interchangeable guides
Loosen the screen and slip the 1/4" guide in place.
The stitch-in-the-ditch guide attaches just as easily
Sewing with the just the foot
You can use the foot all by itself to do 1/8" seams. These tiny seams aren't used a lot for home décor, but quilters use this seam for miniature piecing.
All you need to do is align your fabric with the 1/8" red guide line and stitch along, keeping your eye on that red line.
You can also use the foot without the guides to sew perfect 1/4" seams on shapes, like triangles. Just like above, simply align the edge of your fabric with the red 1/4" guide line.
Sewing with the 1/4" guide
My sewing machine came with a 1/4" foot, but you may not be that lucky. Often a 1/4" foot is a specialty foot you must purchase separately, which makes this three-in-one foot such a great deal. I use a 1/4" allowance all the time for seaming, hemming and topstitching.
With the guide in place, you simply align the edge of your fabric against the guide and start sewing. Keep the fabric close to the guide as you go and you'll get a perfect 1/4" seam every time.
The straight stitch needle hole in the foot is slightly oval, which means if your machine allows you to adjust your needle position, you can move the needle to the right and stitch a perfect scant 1/4" seam. This is a quilting technique experienced quilters often suggest for beginners. Every time you press your seams, a little bit of fabric gets taken up in the fold. With each seam, you loose a little bit more, which can add up, especially if you are new to piecing. Sewing a scant 1/4" helps compensate for this.
NOTE: There's a small hole to the left of the needle hole. This is a "needle release hole" and it is not used for sewing.
Sewing with the ditch guide
I love the ditch guide; it's like a laser line for keeping a straight seam. All you have to do is align your fabric so the guide is in the ditch created by the previous seam you are following. As you sew along, just keep the guide running in this ditch.
I really had fun with this foot. It does three very different things and does each one very well. I give it five stars. It is made by and for Janome machines with their snap-on feet, but check with your local dealer, it may work on other brands and/or there may be a similar foot available for your particular model.