I dont have a 3d printer but I have a lot of wood. I had some 1.5" metal conduit for the mockup. The forstner bit is 1.5" and the conduit is very tight. Plus I think I will eliminate the two 45 degree angles and make a straight 90 degree, basically an upside down L. If the conduit works I will just give it a silver paint finish along with the oak pieces will also be painted silver or black.
The lower part of the pic is the rectangular base and then the two 45 degree with 90 degree will have the conduit in it and then one more section of conduit not shown that will terminate in the middle of the XL with a vacuum hose tied with velcro and/or wire ties and maybe the router power cord like the OneInfinity boom one. I am s till playing with the conduit lengths to get in the right place.