Haha - now I feel like “grumpy old man”. Why doesn’t he just use a weight? Some even come with a counting function! 
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AFAIK, weight is a common way to do it. But there is a surprising amount of variance and small screws with large quantities make it difficult.
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Pen-plotter art vending machine! Really neat. I guess many in here would be susceptible for such a project.
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I love the machine. I really do not like the, umm, art???
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This Guy has some neat mechanical movements.
At the beginning of the video he mentioneds Solidworks for makers for $48 per year.
Go to his Solidworks link ,20 percent off.
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Mind Blown! 
Greg Brown is VP, Head of Product at Onshape Skip through the prelim parts if you must, but Onshape can now scan direct to cad via a phone.
I can see so many uses for this process!
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Really interested, but looks like no android support
There is an Android App available in Google Play but to be a bit nit picky, Android devices generally do not provide lidar support.
None the less, if you can create a scan with your device, it would be a two stage process, but you can still import it into Onshape and use it as described above.
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That really is incredible. Too bad my iPad Air 4 does not have LIDAR. 
Same comment as for android- you can still scan and import!
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would need an app that can do a photogrammetry scan on the android device. I’ve not found a good one yet.
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