The problem to be addressed is to provide a composition for a 3D printer such that when forming a model (layered structure body) with a hot melt lamination 3D printer using a composition containing an inorganic powder as a raw material, the model is obtained with minimal interlayer cracks and stringing. The invention is a composition for a 3D printer comprising (A) an inorganic powder and (B) an organic binder, the composition for a 3D printer being characterized in that: the organic binder (B) is selected from the group consisting of (B1) thermoplastic resins selected from among non-crystalline polymers and EVAs, (B2) thermoplastic resins selected from crystalline polymers excluding EVAs, (B3) waxes, (B4) lubricants, and (B5) other additives; (A)/(B) = 100/5 to 100/30; (B1)/(B1+B2) = 0.5 to 1.0; (B3)/(B) = 0.07 to 0.4; and (B4)/(B) = 0 to 0.18.
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