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containing formulation tested and certainly shows a limit. The samebehavior is also reflected in Fig. 8b, in which W/C ratios of 0.65 and0.57 presented a higher and lower creep compliance respectively, in-dicating that the clay samples with a higher water content are deformedmore slowly and gradually under a constant stress than samples with alower water content. The yield strength curve was not included inFig. 8b as it was not possible to test yield strength under the sameconditions, confirming that the lack of water led to a very differentmaterial. As the DIW process used in this research for printing is basedon the clay flow, all of these results are important. The easiest flow isdesired for the extrusion process, although an extremely easy flow canlead to stability problems for the printed parts due to the high watercontent. Thus, there must be a balance in the flow and rheology char-acteristics of the printing material. First, the flow in the extruder mustbe high in order to reduce the force and its corresponding problems.Second, the flow in the printed parts must be zero in order to reducedimensional changes.
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