PCL and nHA were mixed in dichloromethane at a ratio of 7:3. After the dichloromethane was partially volatilized, the mixture was printed into a porous scaffold with a fused deposition modeling (FDM) 3D printer. The manufactured scaffolds were divided into two types: one is a square with the side length of 8 mm, another is a disc with a diameter of 4 mm, and the thickness of all scaffolds is 1 mm. The square scaffold serves as a carrier for cells in vitro while the disc scaffold is used in vivo. Then, the scaffolds were placed in a fume hood overnight to completely volatilize the residual dichloromethane. Finally, these scaffolds were sterilized by ethylene oxide in the hospital.

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