Made this at the request of a friend. I've never used a sewing machine, but I made this one to the same dimensions as the one her grandma uses.
For print settings, I printed this with 3 or 4 walls (instead of 2) and increased the infill to maybe 50% or so. I can't remember exactly. Just to sturdy the thing up a bit. It is such a small part after all, no significant difference in material cost or time printing.
If you print this, let me know by posting a make! It encourages me to see when and how people are putting my files to good use.