This is a small size power supply with low cost and easy to make that only taking about 5 more hours. I was very happy with it and would share with you.
Power Supply Specifications
Input: 5v-16v/3A DC
Output: 1.3V - 15.5V/2 Amps
Here is a list of materials and tools I used for this project.
2 x LM2596S DC-DC module link
2 x Voltage/Current DC0-100V LED meter link
2 x WXD3-13-2W-10K link
2 x D3-13-2W knob link
2 x 4MM banana jacks(Red + Black) link
2 x 4MM banana sockets(Red + Black) link
1 x switch 117S 8.5*13.5MM link
1 x Power Jack DC-022 DC 5.5mm 2.1mm link
1 x AMS1117-5V link
1 x 5V 30mm fan link
6 x 2.5mm/6mm screw
1 x DC adapter 16v / 3A, the voltage range between in 9v~16v would be better.
3D printer with PLA withe & gray color