self-extendable gearbox upgrade version

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I design this extendable gearbox for convenient daily use. It is easy to make and use using 3D printed parts and ball bearing. Since I use a self-extendable unit, it is very easy to expand to the gear ratio which you want. Hope you will like it. Detail information on Youtubehttps://youtu.be/GilkxIRx7hc

About the author:
Henry Wang
I am a former scientific researcher who usually worked in University and academic institutes. I am interested in making things using 3D printer. Since this April I worked alone at home. I am now focused on making improvement of household small things better use or invent some useful or dammy stuff which makes life happy. I will continuously upload my stuff here and upload videos on Youtube. Please check my youtube channel and subscribe. I will not fail you. Everything I designed has some unique new ideas which no one ever noticed yet. I will share it with you and wish you also share your experience with us. Make our world a better place. Hope you will have a nice day. subscribe to my channel http://youtube.com/tubeunderdeveloped

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