This is my skull, built from CT data and laser scans of dental molds.
MatterHackers Build PLA
Can be printed on FDM and SLA/DLP. This is full scale and anatomically accurate so it is already hollow, but will require a lot of support if printed with an FDM printer.
This is from a CT scan taken prior to sinus surgery. I processed the DiCOM data then digitally sculpted the result to eliminate topographical errors and incomplete data in ZBrush.