AMS stacking stand - leg extension

Adding futher height to MihaiDesigns brilliant AMS stacking stand for bambu labs printers so that the lid of the lower AMS can fully open. Good for tighter spaces so that the bottom AMS doesnt need to be slid forward to load/unload spools. Included 3mf file is setup to print both left & right models on their own plate @ 0.20 with supports for the slots (untick on build plate only if you are downloading STLs). Standard walls and infil is fine. Original model by MihaiDesigns here.