It works. Tiny, simple, and only $1 worth of parts. This is the prototype.
I used nothing but the pump from a $1 bottle of hairspray I got at Target and a little juice bottle I had lying around (I think it came from JC). Squeeze the pump and it re-saturates the cart filling. Everything is press fit, no glue, no leaking. The only tools needed are a drill and something to cut the tubing.
Refined smaller version and tutorial to come.



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