This is a companion item to my Herringbone Sliced. This is the unsliced version. It's also solid, since it would require some sort of internal support for the top otherwise. I printed two of them for a friend, at 25% and 5% fill, and both turned out fine in PLA.
Flashforge Clone (Monoprice)
Printed both at 5% infill and 25%, with no issues, in PLA with no supports or rafts.
Made in Autodesk Inventor, doubled into a herringbone in AutoCAD.