Make sure it sticks well!
Make sure just to clean up all of the support, then you should be good to go!
Bolt It Up
Using 2 Hex bolts per extrusion simply slide the end of the head of the bolt into the end of the extrusion then put the end of the bolt through the holes in the printed part. After that using a nut that matches the bolt tighten the extrusion down to the printed part, making a rigid connection.