Potato Masher

A potato masher that is nice and stiff, easy to grasp with slipping protection, and isn't horrible to clean. The second version requires minimal support.
There is an alternate version that requires zero support instead (but doesn't have the dimple in the middle that makes pushing the last millimeter easier).
The height is 200mm (fits well in a Prusa I3), so check your printers build volume and scale down if necessary.

Multiple perimeters increase the strength of this print more than higher infill percentage. For maximum strength, choose enough perimeters so that they connect to a continuous circle in the handle. For mashing boiling hot potatoes, consider using high-temperature filament. Try to avoid an elephants foot when settings printing parameters (or remove it afterwards if necessary) and maybe smooth the end of the handle a bit.