Robert Kimball

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Personal project

Sponge Holder

Problem
Design a 3D-printed sponge holder with a working drainage system that is convenient to use.
Date
Dec 2025 – Jan 2026
Tools
SolidWorks, 3D printing (PLA, PETG)
Result
Easy-to-use holder that drains directly into the sink without leaving water on the counter
Sponge holder: original design demo
Sponge holder: final design demo
First sponge holder prototype in white with a yellow sponge, on the counter next to the sinkOpen larger image
Design iterations: first version
Final green sponge holder with a larger basin, hooked over the counter edge above the sinkOpen larger image
Design iterations: final version

Design process

  • Measured the sponge and used the dimensions to create a 3D model in SolidWorks.
  • Printed models in two materials, PETG and PLA.
    • PETG has better temperature and water resistance, so it is the better material for the final product.
    • PLA prints much faster but does not handle long-term water exposure. It is best for quick prototypes here.
  • Iterated on the first model to improve performance.
    • Increased the size of the basin to make the sponge easier to remove.
    • Added a hook that wraps around the edge of the counter so the holder does not move and water does not spill.

Result

  • A functional, easy-to-use sponge holder that drains directly into my sink without leaving water on the counter.

What I learned

  • Drafting curved surfaces for drainage in SolidWorks
  • Differences between PETG and PLA filament for 3D printing