Use this to hold your sketching pencils, tools or simply collect PLA scraps and trimmings. I got tired of sweeping PLA bits off the table, and then having to sweep the floor. This slide-out tray catches everything and with a brush (or piece of tissue paper) I can sweep it all neatly into a small bin or envelope for disposal. All 3D printed parts except for the 3-inch electrical trunk cap and screws.***** UPDATE 9 Oct 2015: Centre bracket and clip added, for long installations.