Conventional two-dimensional (2D) ultrasonography is the gold standard for diagnosing congenital heart disease (CHD). However, characterization of complex CHD may be limited by 2D imaging methods that lack crucial spatial information, as these images are generated as individual 'slices' without orientation and with a limited field of view lacking depth, and therefore they are not ideal for three-dimensional (3D) modeling and printing. While approximately 90% of 3D printed models of the cardiovascular system are derived from computed tomography (CT) or magnetic resonance imaging (MRI) 1 , these modalities are used sparingly in clinical practice. Advances in 3D and four-dimensional (4D) ultrasound have expanded the capabilities for assessing the fetal heart and have paved the way for creating ultrasound-derived 3D printed models.Medical 3D printing applications of 3D ultrasound-derived imaging data have been demonstrated for cardiac models of valvular and septal CHD 2 . Olivieri et al. verified the accuracy of models created from 3D ultrasound data of CHD patients 3 . Currently, while 3D ultrasound-derived 3D prints have been used to produce physical models of whole fetuses 4 and for surgical rehearsal prior to fetoscopic repair of spina bifida 5 , the majority of prints have been created for fetal structures with a rest period, such as the face or the back. Here, we demonstrate the feasibility of 3D printing of a small fast-moving fetal anatomical structure without a rest period, i.e. the fetal heart, using only 3D ultrasound data.To create a 3D model of a fetal heart, 3D fetal ultrasound data were obtained from a Voluson E10 ultrasound machine (GE Healthcare, Chicago, IL, USA).