How about a ‘comb’ with 1cm teeth and gaps just wide enough for seeds to get through (hopefully the width of a saw blade would work..) to deal with the side to side spacing, then manually do the row spacing using a steel ruler in front of the comb which you lift to let seeds throug wherever you want a row.
Alternatively, find out who makes the robot the supermarket suppliers use, and ask them to give you a price for making you a bespoke small-scale machine?
Alternatively, find out who makes the robot the supermarket suppliers use, and ask them to give you a price for making you a bespoke small-scale machine?
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