B2 Corner Connector
Used to connect corners of 3 tubes.
Cut out the shape on a laser 3 times (DMG file is enclosed to this page).
Bend on a press brake according to the image.
Costs, Profit, Investment, Break Even
The figures below are an example that has to be adjusted to your local conditions. The table is an interactive calculator, which allows you to change (the blue) values and add/remove rows/columns.