Päärmäin (hem maker for sewing machine)

thingiverse

This tool makes an 8mm narrow fold. Before printing, rotate the model so that it is in the position shown by the image, narrow end up. Manual: 1. Place the edge of the fabric inside the guide, and attach the beginning of the fold with a pin if needed. 2. Attach the guide directly in front of the presser foot using tape or another securing method. 3. Sew! Guide the fabric as shown in the picture to achieve a smooth, even fold. 4. Thicker seams can get stuck in the guide, so it's best to remove and reattach it before reaching these areas.