I needed to sew a whole bunch of folded hems for my DIY hammocks and other outdoor gear. Some materials are hard to iron and shouldn't be pinned. This folded hemmer attachment helps tremendously. When I first designed this I didn't have any presser foot that fit my old but trusty Singer 201K, and even now when I got a whole bunch of them I find the printed ones easier to use.
Hem width, length of guide channel, position of mounting holes etc. can be easily customized to fit just about any sewing machine. The default values fit my Singer 201K, 670G and I have also made one for my Husqvuarna Viking Emerald 116.
I found that having mounting holes is not a big deal since I usually tape the hemmer to the machine.
I experimented with a funnel like opening of the guide channel but found that it works quite well without.
I've successfully used this for several projects, but I'm sure there is potential for improvement.
Please post coordinates for holes for other models in the comments section if you make one.
Makergeeks Raptor PLA
Settings a probably not that critical since no supports are needed.
Please not that if the mounting holes stick up far you make two small towers that might not cool down enough between layers if printing too fast. You might have to manually slow down when you get to this point.
Use a sharp knife to clean out any extra plastic in the opening. Especially when printing on a glass plate the bottom tends to squish a bit.