Baby Billy's Betta Bunkers

Featuring 40 mm entrances, a living area 48 mm tall and 112 mm wide, and filleted edges, this comfy donut-shaped abode might be the perfect place for your betta to hide when they don't want to be perceived!

The small hole in the center of the donut is sized to fit around a bamboo skewer, which is too small for a betta to be caught in. Use the optional plug if you wish to close it, or use a skewer to stack them into a multistory abode! (Holes between stories not yet supported.)

Designed to print in two pieces with no supports (no bridges or overhangs greater than 30 degrees). I glue the halves together by filling the grooves with super glue and placing a heavy book on top to ensure no gap is left.

My Orca settings for a leaky print:

• Walls - 3

• Top and bottom - 0 layers, 0 mm

• Infill - rectilinear, 10% for model, 40% for height layer modifiers at 0-1 mm and 3-4 mm

While you can use more infill to ensure the model is dense enough to sink, I use less infill and no top/bottom layers to ensure the model fills with water. I used a rectilinear infill of 10% for the base model, then added height layer modifiers in Orca to create a leaky "top" and "bottom." I used two separate layers with 40% rectilinear infill at 0-1 mm and 3-4 mm. This creates a mesh with pores 0.6 mm wide, which allows water and a small amount of direct light to pass through. According to my slicer, each half weighs 37g when printed, saving about 40% of the plastic compared to a watertight sinking print.

(Tip: add height layer modifiers to one piece, then clone the part to duplicate those settings on the other piece.)

The volume of each half is 60-69 cm^3 depending on the number of holes. If you choose to print a watertight model, ensure the weight of each half is greater than 60-69 grams. Assuming my densities in Orca are correct, this should be achieved with 80% infill for PLA or 75% infill for PETG.