Use of strands in a fused deposition modeling printing process, said strands comprising a composition comprising, with respect to the sum of components i.-iv.: i. 10-90% by weight of at least one polyester comprising: a) a dicarboxylic component comprising, with respect to the total of the dicarboxylic component: a1) 0 -80 % by moles of units deriving from at least one aromatic dicarboxylic acid, a2) 20-100 % by moles of units deriving from at least one saturated aliphatic dicarboxylic acid, a3) 0 - 5 % by moles of units deriving from at least one non saturated aliphatic dicarboxylic acid; b) a diolic component comprising, with respect to the total diolic component,: b1) 95 - 100 % by moles of units deriving from at least one saturated aliphatic diol; b2) 0- 5 % by moles of units deriving from at least one non saturated aliphatic diol; ii. 5 - 90 % by weight of at least one polyhydroxyalkanoate; iii. 0 - 5% by weight of at least one crosslinking agent and/or chain extender comprising at least one di- and/or polyfunctional compound carrying isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxy, anhydride or divinylether groups and mixtures thereof; iv. 0 - 50 % by weight of at least one filler.. i. 10-90% by weight of at least one polyester comprising: a) a dicarboxylic component comprising, with respect to the total of the dicarboxylic component: a1) 0 -80 % by moles of units deriving from at least one aromatic dicarboxylic acid, a2) 20-100 % by moles of units deriving from at least one saturated aliphatic dicarboxylic acid, a3) 0 - 5 % by moles of units deriving from at least one non saturated aliphatic dicarboxylic acid; b) a diolic component comprising, with respect to the total diolic component,: b1) 95 - 100 % by moles of units deriving from at least one saturated aliphatic diol; b2) 0- 5 % by moles of units deriving from at least one non saturated aliphatic diol; a) a dicarboxylic component comprising, with respect to the total of the dicarboxylic component: a1) 0 -80 % by moles of units deriving from at least one aromatic dicarboxylic acid, a2) 20-100 % by moles of units deriving from at least one saturated aliphatic dicarboxylic acid, a3) 0 - 5 % by moles of units deriving from at least one non saturated aliphatic dicarboxylic acid; a1) 0 -80 % by moles of units deriving from at least one aromatic dicarboxylic acid, a2) 20-100 % by moles of units deriving from at least one saturated aliphatic dicarboxylic acid, a3) 0 - 5 % by moles of units deriving from at least one non saturated aliphatic dicarboxylic acid; b) a diolic component comprising, with respect to the total diolic component,: b1) 95 - 100 % by moles of units deriving from at least one saturated aliphatic diol; b2) 0- 5 % by moles of units deriving from at least one non saturated aliphatic diol; b1) 95 - 100 % by moles of units deriving from at least one saturated aliphatic diol; b2) 0- 5 % by moles of units deriving from at least one non saturated aliphatic diol; ii. 5 - 90 % by weight of at least one polyhydroxyalkanoate; iii. 0 - 5% by weight of at least one crosslinking agent and/or chain extender comprising at least one di- and/or polyfunctional compound carrying isocyanate, peroxide, carbodiimide, isocyanurate, oxazoline, epoxy, anhydride or divinylether groups and mixtures thereof; iv. 0 - 50 % by weight of at least one filler..