This is a thing designed to keep a washing machine still on a wooden floor…
Our Candy™ Washing machine was going for a walk; so needed tied down, the solution was to make a pair of 3D Printed foot retainers for it…
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This is not one of my designs, it is one I have downloaded from Thingiverse (STL)
I have a couple of these ESP8266 boards Lego Train: Duplo Compatible Motorized Locomotive [[https://www.thingiverse.com/thing:2479704|thing]]
Thingiverse ISS Pointer Files