Hey! I made a simple outlet holder for my Tetra EX 600 Plus external aquarium filter as the stock suction cups holders that were holding the tube, were falling out constantly. The diameter of the outlet tube is 17 mm (as the stock one) so you shouldn't have any issues attaching it.
Just make sure you DO NOT have ANY infill in the tube clamps part. Otherwise you'll not be able to clip the tube into it.
The author marked this model as their own original creation.