I have a female betta in a community tank, and I wanted to give her something that (a) gives her protection from the fast flowing water, and (b) gives her a nice place to sleep where the guppies won't bother her. This is the solution I came up with.

It's a box with one entrance, divided into three compartments. It has a slide-on lid to reduce the need for supports and allow you to customise the lid without reprinting the entire design. The uploaded design has a window in the big compartment on the sides and top - I've put frogbit in this area as my betta absolutely loves playing in it. The end compartment is completely enclosed to allow the betta to sleep/hide.

How to use: Print the main body, lid and 3 of the brackets. The brackets each accept an Eheim Jager suction cup (product number 7271100). Stick the brackets to the side of the aquarium with suction cups, then place the house on top of them.

Current issues: The box floats, so must be placed at the surface. This is fixable with a different bracket design, which I'm planning to revise at a later date.

Creality

Ender 3

Yes

Yes

0.24

20%

I printed this with support enforcers in the side windows only - the holes between compartments don't need supports. In my case the layering was slightly iffy in the overhangs on the main body where the lid slides in, but it didn't cause any major issues. You may want to consider printing with supports there if your printer doesn't handle overhangs very well.

I also printed with a brim, as this is a large print (160g~ for the main body) so not worth the risk of corners lifting etc.