This is an extension piece for the legs on any IKEA Lack table with legs around 50~51mm legs. I designed this to raise the table enough so that my Logitech Z623 subwoofer would fit under the lowest shelf. (The subwoofer is around 11.25" or so tall.)
With these extensions in place, there is about 11.4" clearance under the lower shelf.
IKEA_Lack_table_leg_extension_-_130mm.stl | 3.2KB |