I have a 201.
1. If you FMQ on a either a 201 or 301, what tips do you have?
Go slow! There's no need to go fast, and you'll have better stitches and quality.
2. What type of thread works best for you?
I've used Aurifill and Connecting Threads thread without issues.
3. Do you use Singer needles, or do other common brands work?
I use Organ needles, the 100/16 size I think. Never had an issue.
4. What size needle?
See above.
5. Do you add a Supreme Slider or other slick surface?
Nope!
6. I have some Bobbin Genies – do you use them?
No, but I'd like to just to see if it improves matters at all.
7. What type of free motion/darning foot do you use? I’m going to have to order a slant shank FMQ foot for the 301. I'd like to find one with an open toe for better visiblity if possible. What works for you?
I used to use the Big Foot (purple and clear plastic), but then I bought the FMQ foot from Sew-Classic, and it seems to work well and allow enough visibility. I really wish there was one as high quality as the Juki feet for example for our machines.