Large drop down rectangle ceiling mounted support

STEP files available in “Download STL/CAD Files”! Mount speakers or other large items to the ceiling with this robust support. Easy and fast to print and really large! The custom designed joint is really solid and easy to assemble. Use the maximum size your printer can do. The interior space is 233mm(9") high and between 400mm(15" ¾) and 450mm(17" ¾) wide.400mm(15" ¾), 420mm(16" ½) and 450mm(17" ¾) wide models are provided. You can mix two sizes to get intermediate width,