Abstract: Provided are resin compositions, which may be used for 3D printing. The resins may be colorless and/or transparent. The resins include a photoinitiator and one or more hard cross-linker. The resins may also include one or more of soft cross-linker(s), reactive diluent(s), filler(s), and additive(s). Also provided are articles of manufacture and methods of making articles of manufacture using one or more of the resins. The articles of manufacture may have one or more desirable mechanical and/or one or more desirable biocompatibility properties. The articles of manufacture may be colorless and/or transparent. The articles of manufacture may be produced using a method of the present disclosure.