SILASTICTM 3D 3335 liquid silicone rubber (LSR) is a new addition to Dow’s EVOLV3D line of 3D-printable materials. To further understand the printing ability of the material, a study was conducted to determine the reproducibility of the quality of the printed part, as well as understand the printing methods that can be used. For printing, a German RepRap X400 V4 printer featuring liquid additive manufacturing (LAM) technology was used. First, a rheological study was performed to determine the material flow characteristics during and after printing. Then the printing methodologies were studied for the quality of the print. To do this, flat plaque samples were printed in two methodologies: (1) The wet-in-wet method, and (2) The bead method. Dog bone samples were printed using the bead method. The mass and geometries were measured and recorded for each plaque and dog bone sample. The samples in each batch showed to have no significant variation between samples with the same printing method. An average shrinkage was shown to be around 2% for the mat printed samples and varied between 0% and 2% for bead-printed samples. These results showcase the ability to create repeatable silicone parts using liquid additive manufacturing and give understanding to how parts should be designed to meet the tolerance requirements.
- Describe liquid additive manufacturing as it relates to German RepRap equipment
- Define the material quality of silicones printed on the German RepRap equipment
- Describe the limitations of both the printable LSR material and printer