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The funnel is wide enough that my son can dump sand in himself without me hovering, and the wheels keep spinning even with wet clumpy sand. Best part is it fits right on the edge of our water table.

The funnel is wide enough that my son can dump a whole cup of water in without missing, and the wheels keep spinning for a good few seconds after. We've also run small pebbles through it and it hasn't jammed once.

My 2-year-old spends a solid 20 minutes pouring sand through the funnel and watching the wheels spin, which is a small miracle. The thing holds up fine at the sand table too, no jamming so far.