A method of assembling a seal includes presetting a spring in a core material and performing a lost core molding process with the spring being preset in the core, which provides for more exact manufacture, leading to lighter weight, higher performance and ability to make complex designs.

According to some aspects, a container is provided for use in an additive fabrication device configured to fabricate parts by curing a liquid photopolymer to form layers of cured photopolymer. The container may comprise a laminated multi-material layer having an elastic first layer that aids in separation of cured photopolymer from the container in addition to a barrier layer on an upper surface that protects the first layer from exposure to substances in the liquid photopolymer that may not be compatible with the material of the first layer.

According to some aspects, a container is provided for use in an additive fabrication device configured to fabricate parts by curing a liquid photopolymer to form layers of cured photopolymer. The container may comprise a laminated multi-material layer having an elastic first layer that aids in separation of cured photopolymer from the container in addition to a barrier layer on an upper surface that protects the first layer from exposure to substances in the liquid photopolymer that may not be compatible with the material of the first layer.

An object of the present invention is to provide a mandrel having flexibility while maintaining heat resistance, releasability, and recyclability that can withstand a thermal history of repeated use, which are characteristics of 4-methyl-1-pentene-based polymer, and the present invention relates to a mandrel formed of a resin composition (X) including 50 to 90 parts by mass of a 4-methyl-1-pentene-based polymer (A) satisfying specified requirements, 5 to 40 parts by mass of a propylene polymer (B), and 5 to 30 parts by mass of a 4-methyl-1-pentene.Math.-olefin copolymer (C) satisfying specified requirements, provided that a total of the (A), the (B), and the (C) is 100 parts by mass.