This model is used in conjunction with a top-mounted tank on the BPX to enable a compact, self-contained design. The recommended parts for this model are:
I printed with the following settings:
This works well with (https://www.printables.com/model/1252599-top-tank-mount-with-rails-for-bpx) for routing the macroline to a top-mounted tank.
The author remixed this model.
This model includes the following changes:
The hole up through the buttstock is the primary adaptation, as it enables attaching a tank to the top of the BPX more easily. A example macroline adapter that works with this is: https://ansgear.com/90-degree-macroline-fitting-swivel
Note that I have no affiliation with ansgear. This was just the macroline adapter that I found and put on the TiPX remote line adapter.