Our team has a Dimension UPrint Plus. We really like it, but it runs around $20,000. We have used it for pulleys, gears to drive potentiometers/encoders, encoder mounts and led ring mounts. I know some teams have used them for wheels etc, but the printing material (ABS) can become prohibitively expensive. The deposition layer thickness is 0.01”.
There is a new 3D printer, the
Form1, which will be available this spring. It was a fully funded kickstarter project that shows great promise. Instead of deposition of thermal plastic, it is based on stereo-lithography. It is intriguing, but I cannot give a recommendation on something I haven’t used. Here's another link to a youtube
interview about the printer.