for the shape, I print my tip and tail spacers in abs and also positioning shims in pla

you can try un other way: give more stability at your router, like this french man https://www.samuelmamias.com/redonnez-d ... efonceuse/
personally depending what i do, i use both techniques: table or more stability.

that's what I think too but having the opinion of people who have used this system is better than a big disappointment afterwards!
thank you for the answer.

Hello, after several years of use in a vacuum bag my current form is starting to age badly. So I'm going to make a vacuum table and I find Jozerr's system very ingenious, I only wonder if when unmoulding the sole is smooth or if there are slight waves on each support point. I thank in advance users ...