Ceramic Resin is a Form X material that requires unique design preparation. Due to its silica content, Ceramic is heavier than other resins and more fragile in the green (unfired) state. Ceramic requires more support than other Formlabs resins. Parts will shrink during firing. Scale all parts before printing to account for shrinkage during firing. Read and follow the design guidelines to achieve success when designing parts to print with Ceramic Resin.
TIP:Parts often require several scaling iterations to reach the desired fired dimensions.
Maximum: 100 mL
Fired Wall Thickness
Minimum: 2 mm
Ideal: 3 - 6 mm
Maximum: 10 mm
Small walls and features may work under 2 mm
Fillet internal edges to avoid stress concentrations and decrease cracking:
Minimum: 1 mm fillet radius
Ideal: 2 mm+
During firing, parts shrink more along the printed Z-axis than the XY-axis due to the lower concentration of ceramic particles between layers. If a model is printed at an angle, this causes a skewing effect when fired. To correct the effect of uneven shrinking, pre-scale the model using the “Z Scale Factor” in the Ceramic material selection menu in PreForm. The printed “green” part will be skewed, but the part shape will correct during firing.
Shrinkage is caused by sintering and gives Ceramic its strength by increasing the density of the part. General shrinkage occurs uniformly across the part, and parts shrink by approximately 15% during sintering. After setting the Z-Scale Factor, use the Size tool in PreForm to set the “Scale” to 1.15 to account for shrinkage.
Ceramic particles can move during sintering, which means that the shape of the model is affected by gravity. Self-supporting structures maintain their shape, but unsupported overhangs tend to slump or collapse. Design structures that are self-supporting to minimize the volume of support structures and to prevent slumping during firing.
Unsupported structures, such as overhangs and bridges, are often unavoidable. There are two major ways to control the potential slumping effect: Print custom setter(s). Setters should be designed and oriented to shrink in the same direction as the part. Fire on supports.