Thermoplastic powder composition and reinforced three-dimensional object produced by 3D printing of such a composition

A reinforced thermoplastic powder composition, comprising:

• at least one polyamide powder with a d50 of less than 100 μm,
• from 5% to 70% by weight of glass fibers:
• with an l50 within the range from 50 to 200 μm,
• with an lmax of less than 450 μm,
• with a d50 within the range from 4 to 40 μm,
• with a form factor F:
• l50/d50 of between 5 and 15, and
• from 0.05% to 5% of a pulverulent flow agent with a d50 of less than 20 μm;
• with regard to the total weight of the composition,
• wherein the pulverulent flow agent is chosen from:
• silicas, hydrated silicas, amorphous alumina, vitreous silicas, vitreous phosphates, vitreous borates, vitreous oxides, titanium dioxide, talc, mica, fumed silicas, pyrogenic silicas, kaolin, attapulgite, calcium silicates, alumina and magnesium silicates.