Tired of liquid soap bottles with their gooey spouts and pumps that are nearly impossible to use with one hand? This wash bar is a whole new way to use liquid soap. The stopper is actually a "bar" that floats in the bottle filled with liquid soap. Lift up the bar and the bottom is coated with a generous layer of soap - just wash your hands like you would with regular bar soap. The slightly rough surface of the 3D printed bar helps scrub your skin better than just using your hands alone. The bar (naturally) gets washed off with each use before you put it back in the bottle. And unlike regular bar soap, the bar never dissolves, dries out and cracks, or gets too small to hold on to. The best of all worlds!

Printing
Print with at least 3 perimeter lines to help make sure both the bottle and the bar are fairly watertight. Printing the bar with 0.2mm layer height gives it a nice, mild roughness that feels like you are getting a little bit of scrubbing. Use 0.3mm layers for a more coarse feel. Use a 10% infill on the bar to make sure it floats easily.

Use (Really, like, who doesn't know how to use soap?)
Fill the bottle up to the shoulder with a fairly high viscosity liquid soap. Drop the bar in – it should float with about the 1/3rd of the bar submerged in the soap. If you find you like more soap on the bar, dunk it a little deeper before removing. When you lift the bar out, touch the end on the tapered rim to knock off any drips. Massage the bar in your hands under water just like with a regular bar of soap. I find this very satisfying as the soft scrubbing action feels like you are using a pumice soap (like Lava), but without the actual grit. Replace the bar after rinsing it off.