This cross shaped design has a V-shaped cross-section and very little contact area with the 3D printing bed surface. It has worked great for me and has helped me identify air draft related adhesion problems - I have placed panels on the left, right and back of the printer, which are not air-tight but have solved the few issues I have had.

More info and 3D printing footage in this video: https://www.youtube.com/watch?v=OM1NdekgLlM

Here is how you can easily modify this (and any other) design in Tinkercad: https://www.youtube.com/watch?v=JZXR5rOJ_QM

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