[OXO cube]

Greg has a Tire Razor reciprocator add on freely downloadable on thingiverse.

tbh i would have been upset if he had monetized my original design 
which is originally a free download on thingiverse ( as are all my designs )

but he didnt ... so props to him 

and he did make a few modifications / upgrades to the original which as stated above  is the way to go imo ( and linked his to mine for reference )

Kev