[LordHeini]

I doubt that filling a long thin channel will ever work. The heat + pressure will always collapse the thin infill walls.

In general infills does not provide much strength to a part, it is way better to have stronger walls.

And z-direction does not need to be more stable than the other directions so there is no need for long continuous strands anyway.

Maybe it would work better with smaller, less tall, slots at the inside of the walls.

Lets say 2-3 layer heights tall, continuously filled slots, which are then interleaved with each other. More like bricks less like columns. The outer wall layers would provide stability to prevent collapse. And over spill or bulging would occur towards the inside of the part.

[Toutouxc]

> z-direction does not need to be more stable than the other directions so there is no need for long continuous strands anyway

I’m not sure I understand. In FDM printing, Z is the only direction where you currently CANNOT have long continuous strands, even if you need them. You always need to sacrifice one direction in which the part is going to suck.

For example, you can easily print an airplane wing with a beautiful, perfectly smooth and continuous airfoil, but you have to include a channel for something like a carbon fiber rod. Without it, the slightest bending force would instantly split the layers apart. Any other orientation will give you a rough surface with steps and a disgusting amount of supports. Being able to add a few strategically placed “columns” (i.e. members in the spanwise direction) could really help this particular usecase.

[LordHeini]

Adding a long strand of Filament in z direction is what the Author of this article tried. By injecting molten filament into a long channel in the infill.

What i meant that the z-direction does not need to be MORE stable than the other directions.

Adding a long strand of filament in the z-direction in the infill (close to the geometric center of the print) might make the print more resistant to stretching but not necessarily bending.

Carbon rods don't bend but filament does. The wing would break apart at the seams event if it had channels of filament along side its z-axis. It would still be more stable, but not as much as one might think.

Walls give a print most of its strength by a huge margin. And interlocking the walls in z-direction would have a proprietorially larger impact.