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Sponge Tray

My daughter asked if I could make a sponge tray for the back of her sink. Simple ask, and the whole design is one idea: a wet sponge sitting in its own puddle stays wet, gets slimy and starts to smell. So this one never lets the water sit.

A green and yellow scrub sponge sitting in a black tray on a granite counter behind a white sink

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One 3MF with the tested PLA profile already set up, and the STL for bringing your own. One piece, 125 × 104 × 25 mm — no hardware, no assembly.

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The 3MF is the faster path — open it and slice. A full print & use guide is attached to the Creality listing.

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Print & Use Guide

The same guide attached to the model listings, hosted here so you can read it before you print — PDF · 4 pages · 778 KB

Open the Guide

What Makes It Work

The Water Never Sits

Set it behind the sink with the drain mouth at the edge of the counter, pointing over the basin, and drop the sponge in. Mine gets a wipe once a week, and that is the whole maintenance routine.

The empty black tray from the front, showing the raised ribs across the floor and the drain mouth cut into the front wall
Raised Ribs Under the Sponge
The sponge rests on ridges, not on a flat floor, so air moves underneath it and the underside dries at the same rate as the top.
A hand pressing a sponge down in the tray while a stream of water runs out of the drain mouth and falls into the sink
Drain Mouth Aimed at the Sink
The opening sits at the front edge and points back over the basin, so everything the sponge sheds goes down the drain and not onto the counter.
The empty black tray seen from behind, showing the back wall and the ribbed floor
Tapered Floor
The base slopes toward the drain opening, so water runs off instead of pooling in the low spot.
A green and yellow scrub sponge sitting in a black tray on a granite counter behind a white sink
Nothing to Clean Out
No trap, no reservoir, no removable insert to forget about. PLA has held up fine on a kitchen sink for months.

Print Settings

Slice It Right

These are the settings baked into the 3MF, sliced with a 0.4 mm nozzle. Open it in any slicer that reads 3MF projects and it is ready to go.

One plate, 4 h 27 m and 68 g — 22.80 m of filament, roughly $1.02 in material, no filament swaps.

Fine layers on purpose. This one sits out on the counter where people see it, so the profile goes for finish over speed, and Z anti-aliasing smooths the layer lines on the sloped top. If your slicer has no anti-aliasing setting, just print it without. Print it at 0.20 mm if you would rather have it sooner.

Supports
None
Layer Height
0.12 mm
Walls
3
Top / Bottom
5 / 5
Infill
9% Gyroid
Brim
5 mm, outer only
Material
PLA · 220 °C / 60 °C
Z Anti-Aliasing
On
Slice data: one plate in PLA, 4 h 27 m and 68 g, 0.12 mm layers, no supports

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Released under CC BY-NC-ND 4.0 — free for personal use, credit appreciated, no commercial use or derivatives.