Ceramic Additive Manufacturing & Bio-Scaffolds

Direct Ink Writing (DIW) & Ceramic Robocasting Calculator

Pseudoplastic colloidal rheology, shear-thinning extrusion, and continuous serpentine lattice toolpath generator for technical ceramics and robocasting.

Process Parameters & Inputs

Technical Ceramic Paste / Slurry:

Extrusion Nozzle Inner Diameter ($D_n$ in $\mu\text{m}$):

Direct-write micro-nozzle orifice diameter.

Printhead Travel Velocity ($v_{\text{print}}$ in mm/s):

Linear deposition speed of the 3-axis gantry.

Lattice Strut Spanning Gap ($L_{\text{span}}$ in mm):

Free-spanning distance between supporting struts in porous scaffolds.

Isotropic Sintering Linear Shrinkage (%):

Furnace densification shrinkage from green state to fired part.

Calculated Engineering Metrics

Volumetric Extrusion Rate ($Q$)

1.98mm³/s

Filament Spanning Sag ($y_{\text{def}}$)

14.2µm (Rigid)

CAD Pre-Scaling Expansion Factor

1.212x (121.2%)

Apparent Wall Shear Rate ($\dot{\gamma}$)

293s⁻¹

Toolpath & Geometry Simulation

Need Flawless DXF/SVG Contours for CAM?

SpotItLive converts technical drawings, raster graphics, and diagrams into clean, continuous vector paths ready for 5-axis CAM and CNC execution.

Convert to Scalable Vector →

Engineering Methodology & Technical Notes

Direct Ink Writing (DIW) & Robocasting Rheology: Robocasting is an additive extrusion process for high-solids colloidal ceramic pastes ($> 50\text{ vol}\%$). Formulations exhibit pronounced shear-thinning (pseudoplastic) behavior with a high yield stress ($\tau_y > 100\text{ Pa}$): the ink flows smoothly through micro-nozzles under high shear, but instantly sets into an elastic gel upon exit to bridge spanning gaps without slumping or requiring sacrificial supports.

Continuous 3D Serpentine Lattice Toolpaths & CAD Pre-Scaling: Green printed ceramic parts undergo significant volume shrinkage during debinding and high-temperature sintering ($1400\text{--}1650^\circ\text{C}$). The green CAD vector toolpath must be pre-expanded by $S_{\text{scale}} = \frac{1}{1 - S_{\text{shrink}}}$. SpotItLive generates continuous serpentine space-filling vector toolpaths that eliminate stop/start retraction drool.