This presser foot has a groove on the underside that accommodates bead or cord material to be tacked down to your fabric. (You'll need to disengage the Pfaff's walking foot.)
Printed in PLA. I used 0.2mm layers, but finer would be better. You'll probably want to sand the bottom surface of the foot so that fabric feeds smoothly. You'll also need a 1/16" diameter, 5/8" long steel pin.