I've FM'd with my 301 but use regular threads...Another thread was asking abt Invisable and Metallic on her new machine etc...
Has anyone used these threads in their 301 for FM and how did it work...

Invisible, rayon and a very fine polyester embroidery thread were all fine. I did have to tweak the tension slightly with the embroidery thread. I haven't tried metallics, but if the fussy Elna used them, then I expect the 301 will do so more happily.