Please include a 2nd attachment for the rear to the H2D. Self-printing is possible, but the tolerance is really tight for this size. It should also be available as a spare part in the store without a complete spoolholder.
You mean a place for a second spool holder?
There is a second place for that, i use it for a poop chute: H2D Poop Chute by CUBEIFY - MakerWorld
I made that poop chute and bucket and also printed a second bracket, everything fits perfectly.