Fresnel lens divides conventional lens into concentric annular sections. First proposed by Buffon in 1748, independently reinvented by Fresnel. Allows construction of lenses of large aperture and short focal length. Can be made much thinner than conventional lenses
Stepper motors are brushless DC motors with precise position control. NEMA17 motor has 200 steps per revolution with 1.8 degrees per step resolution. Drivers enable precise control through H-bridges and microstepping
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Ender 3 V3 KE has 220x220x240mm build volume with PEI spring steel bed. Neptune 4 Pro features 225x225x265mm build volume with spring steel bed
STL files are essential for 3D printing and require proper viewing before printing. Free viewers allow examining models without heavy CAD programs. Reviewers evaluated based on ease of use and functionality
FDM was developed by S. Scott Crump in 1989 and patented by Stratasys. FFF emerged in 2009 after Stratasys patent expired. FDM uses heated chamber, FFF lacks controlled temperature environment