If your up to it, I would grab Fusion 360 (or some other package) and just design it and see what it costs to print. That would save a crap load of money and still be fun. If your not going to print often its a waste of 300
This. Fusion 360 is free for personal use. Or try Tinkercad to make your part out of geometric shapes (cubes, cylinders, pyramids, hexagons, etc.) It's very easy to use for making simple parts.