The clamp should be printed with as many walls as is required to make it solid, rather than using infill, and I recommend PETG filament for this one as it doesn't deform much over time or break when pushing implements into the clamp jaws.

Works best with normal garden tools, such as rakes, brooms etc. It is quite sturdy, though, so it would hold up to more abuse than that (as you can see in the photo).