3D printing is the perfect tool to fix little things in everyday life that are always annoying but too time-consuming to fix with other methods.
The new brackets to attach flower boxes to the railing of our balcony are (like most things purchased) poorly thought out. I have simply constructed spacers that can be clipped into existing holders and ensure that the flower boxes hold properly. A small thing, but again the crap of the industry improved to something useful.

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