This document reviews the development of a low-cost 3D printer. It begins with an introduction to 3D printing technologies and a brief history. It then discusses the key components of a 3D printer, including stepper motors, power supplies, control boards, drivers, endstops, thermistors, and extruders. The working principles and typical materials used in 3D printing like ABS and PLA are explained. The goal of the work described is to build an accurate and low-cost 3D printer that can print small parts at a lower price than commercial 3D printers currently available.