agmcmll created this amazing router plane: Ajustable Router Plane by agmcmll . It's designed to easily accommodate different chisel sizes--so I'm sharing the channels I had to create for my own tools.
I have a Narex ¼" and an ancient Stanley ½" – specific channel dimensions are:
12.05mm (½" chisel)
6.34mm (¼" chisel)
Printed them in PETG with 15% infill and 3 perimeters (as recommended by agmcmll)
The author remixed this model.