Polycaprolactone (PCL) and poly(lactic acid) (PLA) are both linear polyesters with low melting points. PCL has been extensively utilized with 3D printing technologies for medical applications because of its low melting point (60 °C). PCL is applied to liver-on-a-chip, bone generation, cartilage reconstruction, etc. PLA, a biodegradable thermoplastic polymer, is also used for tissue engineering purposes as well as medical implants, screws, stiches. Polyethylene is used for medical implants, even extended to facial and cranial reconstruction with its porous high-density polyethylene form . Poly(vinylpyrrolidone) can perform as the 3D hierarchical porous structures for further tissue engineering. Polystyrene is capable of being adapted to display bioreplication/biotemplating. Poly(methyl methacrylate) is mainly applied to dental materials like orthodontics and drug loading/drug delivery.