a bad carpenter blames his tools

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Related to carpenter: Carpenter bees, Carpenter ants

a bad carpenter blames his tools

If someone performs a job or task poorly or unsuccessfully, they will usually lay the blame on the quality of their equipment, or other such external factors, rather than take responsibility for their own failure. The football player blamed the overinflated ball for costing his team the game, but as they say, a bad carpenter always blames his tools.
See also: bad, blame, tool