Stratasys Ltd. announced last week enrollment is now open for 3DHEART, an investigator-initiated trial. 3DHEART, which stands for 3D Hearts Enabling A Randomized Trial, is a randomized, single-blind clinical trial to study the use of patient-specific 3-D-printed models in pre-operative planning for pediatric heart surgery. Stratasys is providing in-kind support with printing of the models to be used in the trial.