Locking system with remove half of the part and fit to another
This is the system that I changed from the second model, instead of remove the material which causing weak point, I make a groove so then the hands will sit underneath the slot, The disadvantage of this system is really hard to get accurate angle.
The Grove and tabs will make the chair legs sit on place
This joining method create a really neat and clean closing
The flat pattern is not different from previous model
To do the final model actually take half of the time of the previous one. I learn and get used to with the material from doing two times model. The important thing is that the dimension of the slot has to be accurate
The second model was actually work except one of the joining method on the back. It tears the material off. And also some cuts are not execute neatly. 1mm bigger size is affecting the whole joining system. This make me have to make the third model.