Well Im back to making things and have a day a week to work on open source projects just for the fun of it [mainly farming tools], these are mechanical devices but electronics ones will soon follow 
As usual the designs are open source, link is below.
You will need a Laser cutter. BOM in the thingiverse files.
Want to Make one:
https://www.thingiverse.com/thing:3911941
Want to Buy one:
Contact mike@aquaponicslab.org
Depending on the size of tray you want to use the price varies from $120-$300
How it works:
This tools works best if your using a dibbler like below:
https://hackaday.io/project/167679-dibbling-plate-put-those-holes-in-the-soil-quick
Video client made:
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