Print both parts Add two nails 50mm long and 3mm diam.. You have a soil mositure sensor you can use to determine if your plant needs watering. see the link below from gardenbot that tells you how to hook it up to an arduino. http://gardenbot.org/howTo/soilMoisture/Print both parts Solder each wires to the 3mm nails Insert both nails in the spacer Put the cover on the spacer Sensor is ready to use Hook up to you favorite controler like an arduino using a voltage flipping style sensor (see connection diagram on gardenbot)