I wanted a carboy drainer that was 3d printable (because why not?).  They're stackable, too.

References: 

This model on Amazon was nice https://www.amazon.com/Blue-Carboy-Drainer-Pack-2/dp/B074KL8QD2 but 

I liked the handle cutout on this model https://www.printables.com/en/model/734966-carboy-drainer 

This model wasn't bulky enough and I didn't like the feet. https://www.printables.com/en/model/33122-carboy-drying-stand

This seemed clever, but too fragile. https://www.printables.com/model/841046-carboy-dryer-for-plastic-23-litre-carboy 

This model was my main inspiration for size but wasn't bulky enough https://www.printables.com/model/305346-carboy-dryer

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