This print fits the plunge base for the Makita DRT50 cordless and RT0701 corded ¼" routers. The dust port is sized for the Festool vacuum hose. The ID starts at 33 mm and tapers slightly for a good fit. It can be printed lying down or standing up. In either case, I suggest using tree supports. Standing gave the best results for me with the least support. It is fastened to the base using the two thumbscrews that come with the plunge base and the springs give it a little movement. It could be secured with regular metric bolts as well. If you need a different size inlet please let me know and I will attempt to create a modified version. I've included an STL version without a lip on the inlet with a 38.5 mm OD, which may allow other hoses to slide over the outside. I added the lip to aid in printing the piece vertically and may be tough without it.