FSR Groove Mount

Groove mount using FSR (Force Sensing Resistor) for automatic bed leveling.
Rather than placing FSRs under the bed as originally proposed (http://reprap.org/wiki/FSR), I decided to put FSRs on the groove mount. Two FSRs are placed between the two parts of the groove mount.
This method allows to probe with lower pressure on the hot-end and can be used with any bed (even heated beds).
I use springs to keep both lower and upper parts together and fasten them to the effector, which protects t