My Smart never came with one, and it's been bugging me since forever so I finally did something about it. Black didn't show up too well so I printed another in orange for the photos. Secured to the carpet with a few strips of 'hook' Velcro on the back and underside. Wide enough to hold Starbucks and McDonalds cups as well as my Brita Fill&Go bottle. The STL comes with brims to help prevent the corners from lifting as it's a big print.Printed on my Mendel90: 0.4mm nozzle 0.48mm extrusion width 0.2mm layer height 20% infill. No support necessary (the vents use tearslots to minimise overhangs) and brims are built into the STL (single layer, just peel them off).