Tetra Crescent 5 gallon aquarium lid

The Tetra Crescent is a popular and very inexpensive 5 gallon aquarium that suffers from an absolutely terrible lid.  I designed a replacement that is sturdier, fits better, and has hooks on the bottom so you can lift it up and it will stay up.  There's versions with and without cutouts for the stock filter, an air hose, or even a raised hat for a bigger light.

I printed the original hat-less version and the two halves snapped together tightly enough that I didn't even need glue.  The hat version required a bit of superglue.