Bambu Lab X1 - top glass riser

Remix of "Bambu Lab X1 - top glass lid cover riser holder shim air vent" by krazyderek to add clearance for 1/16" (1.6mm) foam tape so there is a little bit of cushion, not just glass on PLA. STEP file has one of each, just mirror them in the slicer. Also added some magnets, similar to the remix by Z3Dart&tech. I only had 3mmx5mm magnets laying around, and should probably be a bit larger to hold better. Very useful for the extra ventilation when using Textured PEI sheet to print low temperature materials (such as PLA).