A prototype design for the probe was created that will clip loosely around the effector platform.  Springs will force the probe assembly downward into the bed as the platform is lowered.  A 15mm x 15mm copper plate will be used as a capacitive sensor.  A 3mm thick foam pad will connect the plate to the 3d printed clip.  Springs will engage under the effector platform and force the foam pad to contact the bed as the platform is lowered.  Once the platform takes up the spring travel the nozzle will contact the copper plate and triggering capacitive sensor.