Since I printed out the complete PegBoard for my P1P, and also a top cover, I had to use the PTFE tube through the opening in the metal housing.
I used the model 5753074 from thingiverse (it fits perfectly into the opening of the frame, the tube passage had to be reworked a little with a round file because it is too narrow).
I then made an opening in the rear cover at the appropriate place.
Printed with 15 % infill and support on pressure plate for the PTFE opening and no brim
P1P ptfe passthrough:
https://www.thingiverse.com/thing:5753074
P1P Pegboard:
https://wiki.bambulab.com/en/p1/modplate-customization#modplate-template