Enclosure for mini Z probe

This is an enclosure for David Crocker's mini IR height sensor board. It protects the board from filament. In case the sensor is used with an untreated or clear anodized aluminium board, a an optical filter can be installed in front of the sensor and the LEDs. I used a cheap film polarizer that can be bought off ebay and cut to size. My polarizer works in the NIR and transmits ~25% of light. The light passes twice through the polarizer (once on the way from the LED to the print bed and once afte