This is a work in progress project for making a simple YAGI antenna that utilizes 20x20 aluminum extrusion and 7mm in diameter rods.
My 3D printer is calibrated differently than your. If you will have issues with the fit, you can edit the source files in FreeCAD.
This model does not currently have 3d printable t-nut, so you should resort to using normal t-nuts or someone else's models.
Things to be done:
The author marked this model as their own original creation.