Circular X-beam that can be used to replace dowels.

The STL file is ~60mm long and 3mm wide, but you can customize it to be anything you want via Customizer or OpenSCAD.

UPDATE: v2 is made in ImplicitCAD (http://www.implicitcad.org/) and features radiused unions (not easily done in OpenSCAD) for strength. They turned out much stronger than the OpenSCAD version.

LulzBot

Mini 2

Yes

Yes

.5mm

10

Printed laying down with beam in X position vs + from side view (as shown in photo).