Singer Sewing Machine Fashion Cams (With ring gear stl)

These are currently UNTESTED clones of vintage singer fashion cams.
UPDATE: CAMS 31 AND 37 ARE NEEDLE-BREAKERS - ONLY USE AT 50% WIDTH!

Being unable to find these anywhere - and Chinese clones going for between $10 and $20 EACH! - motivation was high to create some open source jobs.

I'd love if you guys/Gals can test these and let me know which ones need work.
I have plans to make a few custom ones of my own too.

See the video for details on the initial design and testing process.

Bonus: Bobbin drive ring gear STL also included. not perfect but will get you out of a jam.

I have tested the type 1 (zigzag) cam on a singer model 527 - which is not specifically designed to have interchangeable cams, but will take these.

There are a couple missing in the series as I have been unable to get quality scans of them, or find a sample anywhere - feel free to send me a flatbed scan of any you'd like me to make.

CAUTION!: If printed on a properly configured machine, these will be a tight fit - as I designed them for laser cutting, and exploited the beam width of the machine, you may want to add 1% to the size - let me know in the comments how you go.

Singer models that these are supposed to be compatible with:

527* (the model used to test these - not designed to be changed easily)

306
319
238
240
248
258
316
320
338
348
360
418
477
478
514
518
538
818
838
1730
1800

Video of the initial design phase.
https://youtu.be/rUxoTvWU1jo

Printing the Bobbin Gear:
https://www.youtube.com/watch?v=KLY6kZeEODQ&t=451s