Will I be held accountable on the Day of Judgment for the steel particles resulting from the erosion of a coffee grinding machine that mix with the coffee, and for the negative health effects of drinking coffee, and is it better not to embark on this project?

What you have mentioned does not necessitate prohibition, nor does it make refraining from undertaking the project preferable. Minor details are overlooked and have no effect. There is no deception or fraud involved in their use towards the buyer, as everyone knows the nature of their work. The potential harms of consuming coffee do not necessitate prohibition. We advise against delving deep, being rigid, and excessively scrupulous.