A mold safety strap and method of use for securing two mold halves together. The safety strap includes an elongated strap body including two side walls extending between a first end and a second end, and an elongated central opening disposed between the two side walls. The first end is connectable to a first of the mold halves and the second end is connectable to a second of the mold halves. An intended break point is formed in a least one of the two side walls. The break point is frangible at a predetermined breaking strain value. The safety strap is sacrificial and intended to break if left on the mold during use, and at a straining force less than required to shear off the attachment bolts.

A three-dimensional data generation method of a threaded fastener for three-dimensional additive manufacturing includes: a step of generating first threaded portion data by enlarging three-dimensional data of a threaded portion of a standard threaded fastener along the axial direction of the threaded portion by a factor of 1.0 to 2.5; a step of generating second threaded portion data by duplicating the first threaded portion data; a step of generating third threaded portion data by disposing the first threaded portion data and the second threaded portion data on the same axis such that one ridge in the second threaded portion data is located between two ridges in the first threaded portion data; and a step of generating fourth threaded portion data by extracting a portion with a length from a part in which the first threaded portion data and the second threaded portion data overlap in the third threaded portion data.