If you want/need to restore an ancient Meopta Flexaret VI, you will note that the old synthetic leather liners will need to be changed… If you have a fresh new set, you are lucky… When I restore my old Flexaret VI, I design an entire set of liners to print.

The liners may be turned face down on printer bed if you want a texturized effect.

I've glued the liners with 3M double sided tape (extra strong).

PETG is the best choice by its extra flexibility…