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I highly recommend the engineers and product designers to check out Onshape, you can get started with Onshape for Free at:

You can watch the two previous videos of this project here: Part 1:

Part 2:

It took a while indeed but it works!! The "small" issue of the marbles getting stuck everywhere brought me to do one redesign after another which in the end took me to reprint every single piece on the machine but at least it solved the problem. In addition to reprinting everything I had to use steel wire for the marbles to roll on because any minimal imperfection would get the marbles unable to start rolling from a standing stop. While I was at it I moved the joints to the middle of the inclines and consequently moved the first gate too and that made impossible for the marbles to get trapped in there too. I changed slightly the marble selection mechanism and now marbles are pushed into the channels instead of rejected out of the elevator. I don't mention in the video why I did it because I hope will be the key of my success in the next and last video for this project where I will try to make it work minute by minute. Join this channel to get access to perks:

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