I wanted to plug up the holes on my original print dry, so that the air just flows up through the top.

I printed this with TPU and it works great! Snug fit, but still removable by hand as needed. Tapered tip makes it easier to insert.

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I also use this one and have had a great experience. It dries well and has a proper vent hole that many small dryers are missing! https://amzn.to/3NaYCZf (affiliate link)