Hi Steve,
First, there's no need to convert your file - just select your raw file and go to the Print module.
There can be many reasons for prints not matching what you see in Lightroom. Here are the top ones.
- Most commonly, your monitor is not properly calibrated. Use a device such as a ColorMunki Display to calibrate with. Use the software's ambient light auto-measurement, or start with a luminance in the 80-90 range. You may have to do some test prints and adjust luminance to match.
- Regarding color cast: you're using a printer profile but not turning off color management in the printer driver.
- Regarding color cast: Printer nozzles are clogged.
If you have calibrated your monitor and have checked the second two, then please provide screenshots of your LR and printer settings.