I tried using the very popular single slot toothpaste tube squeezer that you can find everywhere.
But when I tried using the toothpaste, the item would slide back down and no toothpaste would come out.
So I decided to add an additional slot to fold the tube back in on itself and keep it from sliding.
The slots are 62mm wide with a 1mm opening.
This now works well for me.

I just use normal printer settings:
2 perimeters
20% cubic infill
PLA
No supports or rafts or anything