A liquid radiation curable composition for additive fabrication comprising: a cationically polymerizable component; a radically polymerizable component; an antimony-free cationic photoinitiator with an anion selected from the group consisting of PF 6 -, BF 4 -, ((CF 3) 2 C 6 H 3) 4 B -, (C 6 F 5) 4 Ga -, ((CF 3) 2 C 6 H 3) 4 Ga -, (CF 3 CF 2) 3 PF 3 -, trifluoromethanesulfonates, nonafluorobutanesulfonates, methanesulfonates, butanesulfonates, benzenesulfonates, p -toluenesulfonates, fluoroalkyl-substituted fluorophosphates, and PF α (R f) β, wherein α and β are the same or different, and are integers from 1-8, and R f contains a carbon atom and a halogen atom, and a cation of the following general formula: wherein R 1, R 2, R 3, R 5 and R 6 each independently represent an alkyl group, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom, R 4 represents an alkyl group, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an alkoxycarbonyl group, an acyloxy group, an alkylthio group, a heterocyclic hydrocarbon group, an alkylsulfinyl group, an alkylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom, m 1 to m 6 each represent the number of occurrences of each of R 1 to R 6, m 1, m 4, and m 6 each represent an integer of 0 to 5, and m 2, m 3, and m 5 each represent an integer of 0 to 4; and a photosensitizer possessing the following structure: wherein R 1 -R 14 are independently H or a C 1 -C 8 saturated or unsaturated, branched or unbranched, substituted, or unsubstituted hydrocarbyl; and a free-radical photoinitiator. a cationically polymerizable component; a radically polymerizable component; an antimony-free cationic photoinitiator with an anion selected from the group consisting of PF 6 -, BF 4 -, ((CF 3) 2 C 6 H 3) 4 B -, (C 6 F 5) 4 Ga -, ((CF 3) 2 C 6 H 3) 4 Ga -, (CF 3 CF 2) 3 PF 3 -, trifluoromethanesulfonates, nonafluorobutanesulfonates, methanesulfonates, butanesulfonates, benzenesulfonates, p -toluenesulfonates, fluoroalkyl-substituted fluorophosphates, and PF α (R f) β, wherein α and β are the same or different, and are integers from 1-8, and R f contains a carbon atom and a halogen atom, and a cation of the following general formula: an anion selected from the group consisting of PF 6 -, BF 4 -, ((CF 3) 2 C 6 H 3) 4 B -, (C 6 F 5) 4 Ga -, ((CF 3) 2 C 6 H 3) 4 Ga -, (CF 3 CF 2) 3 PF 3 -, trifluoromethanesulfonates, nonafluorobutanesulfonates, methanesulfonates, butanesulfonates, benzenesulfonates, p -toluenesulfonates, fluoroalkyl-substituted fluorophosphates, and PF α (R f) β, wherein α and β are the same or different, and are integers from 1-8, and R f contains a carbon atom and a halogen atom, and a cation of the following general formula: wherein R 1, R 2, R 3, R 5 and R 6 each independently represent an alkyl group, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an arylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an arylthiocarbonyl group, an acyloxy group, an arylthio group, an alkylthio group, an aryl group, a heterocyclic hydrocarbon group, an aryloxy group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom, R 4 represents an alkyl group, a hydroxy group, an alkoxy group, an alkylcarbonyl group, an alkoxycarbonyl group, an acyloxy group, an alkylthio group, a heterocyclic hydrocarbon group, an alkylsulfinyl group, an alkylsulfonyl group, a hydroxy(poly)alkyleneoxy group, an optionally substituted amino group, a cyano group, a nitro group, or a halogen atom, m 1 to m 6 each represent the number of occurrences of each of R 1 to R 6, m 1, m 4, and m 6 each represent an integer of 0 to 5, and m 2, m 3, and m 5 each represent an integer of 0 to 4; and a photosensitizer possessing the following structure: wherein R 1 -R 14 are independently H or a C 1 -C 8 saturated or unsaturated, branched or unbranched, substituted, or unsubstituted hydrocarbyl; and a free-radical photoinitiator.