This is a handle to hold half of a standard yellow sponge.

I was never able to find the same holder online I had from way back in the day, so I designed this one.

Cut a yellow sponge into halves, and then slide one half into the center slot by squishing it. Then, slide the sponge to the front, locking it into position via the two small barbs.

I recommend printing the model on its side, such that the layers give strength along the handle. The middle slot may be filled with support structures. After printing, sand the barbs a bit to make the sponge go over them smoother.