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The second larger one is hollow but I made the walls too thin (.080") and the build supports were a pain to get cleaned up. The upper tube also broke off partially due to the overly thin wall and due to using a low-res, quick print.

So this is what I jotted down to change:

1. Thicken the walls to match what I used on the center vent. I don't remember what I used but I'll pull up the center vent model to measure it.

2. Make it 2 pieces. The top is mainly planar so I will make the top a separate piece and put some lugs/tabs on them to screw the pieces together as well as bond the parts to each other to make it permanent. This will also make it easier to print.

3. Add internal vanes to direct and spread the air. This will also help in making it easier to fastener together and make the print easier.

4. Print using HT-PLA-GF and anneal to make it more durable.

We'll see if this fixes everything.