# New Trends in 4D Printing: A Critical Review
## Nomenclature
(2017)_ [PERSON]; [PERSON]; [PERSON]; [PERSON] Investigating the shape memory properties of 4D printed polylactic acid (PLA) and the concept of 4D printing onto nylon fabrics for the creation of smart textiles. _Virtual Phys. Prototyp._**2017**, _12_, 290-300. [CrossRef]
* _[PERSON] et al. (2018)_ [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; et al. Shape memory behavior and recovery force of 4D printed laminated Miura-origami structures subjected to compressive loading. _Compos. Part B Eng._**2018**, _153_, 233-242. [CrossRef]
* _[PERSON] et al. (2022)_ [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] Rigidly flat-foldable class of lockable origami-inspired metamaterials with topological stiff states. _Nat. Commun._**2022**, _13_, 1816. [CrossRef] [PubMed]
* _Ehrmann and Ehrmann (2021)_ [PERSON]; [PERSON] Investigation of the Shape-Memory Properties of 3D Printed PLA Structures with Different Infills. _Polymers_**2021**, _13_, 164. [CrossRef] [PubMed]
* _[PERSON] et al. (2022)_ [PERSON]; [PERSON]; [PERSON]; [PERSON] Quasi-static mechanical properties of origami-inspired cellular metamaterials made by metallic 3D printing. _Mech. Adv. Mater. Struct._**2022**, _1-14. [CrossRef]
* _[PERSON] et al. (2017)_ [PERSON]; [PERSON]; [PERSON] Large Shape Transforming 4D Auxetic Structures. _3d Print. Adit. Manuf._**2017**, \(4\), 133-142. [CrossRef]* [PERSON] et al. (2020) [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Shape memory response and hierarchical motion capabilities of 4D printed auxetic structures. _Mech. Res. Commun._**2020**, _103_, 103463. [CrossRef]
* [PERSON] et al. (2020) [PERSON]; [PERSON]; [PERSON]; [PERSON] 4D printing soft robotics for biomedical applications. _Addit. Manuf._**2020**, _36_, 101567. [CrossRef]
* [PERSON] et al. (2021) [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] 3D-Printed Biolensics with Shape-Memory Behavior Based on Native Bovine Serum Albumin. _ACS Appl. Mater. Interfaces_**2021**, _13_, 19193-19199. * [PERSON] et al. (2017) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] High-Power Actuation from Molecular Photoswitches in Enantiomerically Paired Soft Springs. _Angew. Chem. Int. Ed._**2017**, _56_, 3261-3265. [CrossRef]
* [PERSON] (2021) [PERSON]; [PERSON]; [PERSON] Effect of Printing Process Parameters on the Shape Transformation Capability of 3D Printed Structures. _Polymers_**2021**, _14_, 117. [CrossRef]
* [PERSON] and [PERSON] (2020) [PERSON]; [PERSON] Controlling toughness and strength of FDM 3D-printed PLA components through the raster layup. _Compos. Part B Eng._**2020**, _180_, 107562. [CrossRef]
* [PERSON] et al. (2019) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Influence of the molding angle on tensile properties of FDM parts with orthogonal layering. _Polym. Adv. Technol._**2019**, _31_, 873-884. [CrossRef]
* [PERSON] et al. (2019) [PERSON]; [PERSON]; [PERSON] Designing for Shape Change--A Case study on 3D Printing Composite Materials for Responsive Architectures. In Proceedings of the 24 th Conference on Computer Aided Architectural Design Research in Asia (CAAADRIA), Wellington, New Zealand, 15-18 April 2019; Volume 2, pp. 391-400. [CrossRef]
* [PERSON] et al. (2021) [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Development of Thermoinks for 4D Direct Printing of Temperature-Induced Self-Rolling Hydrogel Actators. _Adv. Funct. Mater._**2021**, _31_, 2009664. [CrossRef]
* [PERSON] et al. (2020) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Programming Shape-Morphing Behavior of Liquid Crystal Elastomers via Parameter-Encoded 4D Printing. _ACS Appl. Mater. Interfaces_**2020**, _12_, 15562-15572. [CrossRef] [PubMed]
* [PERSON] et al. (2020) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] 4D Printing: Materials, Technologies, and Future Applications in the Biomedical Field.