Giá đỡ ống PTFE cho dry box feed tube của FLSun S1 Pro

About one time in three, when feeding filament from the dry box, it would jam in the filament sensors, the initial PTFE tube would flex, and it would pop out of the hole in the dry box and require three hands to get the tube back into the hole.

This supports the PTFE tube so that doesn't happen.

I've just printed this and installed it, so no testing yet.  I may have to make the clip a bit more clippy, but it seems to at least fit on.  I'll update after a week or two of testing it.