Small Fish Feeder

20250807 Update

After more than ten days of testing and iteration, the "Large - Optimized Leakage Issue - Enjoyment Version" has achieved good printing results, with the air chamber being less prone to leakage, and red worms less likely to escape or suffocate. One plate can hold a maximum of 100g of red worms, with 50g recommended. If you put in more, you must strengthen water circulation, for example, by allowing filtered water to flow through the floating plate, or by having a wave-making device blow onto the floating plate

Other configurations that easily caused large numbers of red worms to suffocate or escape have been removed

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20250725 Update:

Some configurations were previously removed because no actual photos were uploaded, so I'm adding them today

Enjoyment Version is still retained because it's quite useful if printed well. However, if this version is not printed well, it will leak (on my own printer, printing with PLA does not leak, but printing with PETG leaks). Therefore, an easier to print Large Version was designed

Also added Medium Version - 100mm and Small Version - 60mm

The original "Fish Can't Reach Version" was canceled due to dissatisfaction with the amount of fish worms it could cultivate and the possibility of leakage during printing. The new "Large - Fewer Holes Slow Eating" version has been uploaded

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After 7 versions of optimization, this version has a regular and aesthetically pleasing shape, reasonable draft depth, and a reasonable buoyancy-draft depth curve. While controlling the speed at which small fish peck at it to be relatively slow, the water flow is increased as much as possible to ensure worms live longer. (I tested this with aeration and filtration continuously running in the fish tank. On the evening of May 20, the filter was not turned on, the fish tank became hypoxic, and fish worms died. Therefore, the specific amount a single plate can hold is for reference only)

150×150mm

Enjoyment Version can hold less than 200g of red worms per plate; it's not advisable to put too much

Fish Can't Reach Version has no holes at the bottom, resulting in poor water permeability, and can hold less than 100g per plate

The square design makes it easier to use surface tension to stay near the fish tank without floating around

No supports, not prone to spaghetti

Feed the worms, when they eat enough and grow strong, they will easily produce small fish. You can also check out my hatching box and get one ready

Important Note: If the fish tank water is not circulating (no wave-making device), it is not recommended for use, because the water inside the plate will not exchange with the fish tank, few worms can be cultivated, they are prone to death, easily causing waste!

Find a way to allow the water in the plate to continuously exchange with the fish tank. Besides running a wave pump, you can also find a way to divert the circulation pump's water into the plate. Otherwise, you can only put fewer worms in the plate; putting too many will really cause them to perish!

Design Key Points Sharing:

This plate, while ensuring proper water permeability and worm leakage, must also meet the relationship between buoyancy and draft depth shown in the figure below. This kind of floating frame is less likely to flip over, and the draft depth will not become unreasonable due to a slight increase or decrease in the number of worms placed!

Printing Parameter Key Points:

3 walls, 1mm top and bottom layer thickness, 10% infill. This ensures no leakage

In short, minimize infill rate while ensuring no leakage!