"This is the kind of product, I imagine, is the result of easily available 3D printing, whether it is worth the material I don't know, but it's definitely creative problem solving. Seriously though, in terms of usability, are the wheels an actual benefit? They might lessen resistance but they also lessen manoeuvrability of the finger to only sideways, moreover isn't folding a paper really annoying with something on your index finger? ( I mean the initial bending/folding not the flattening of the fold)"

"First I thought, an umbrella with solar panels, weird combo, wouldn't have thought of that.Then I saw it's purpose and was like "hey this could work, might be a little heavy though"Then I remembered how busy it is in Mecca during that pilgrimage (at least what I get from the pictures) and how annoying an umbrella like that would be, try unfolding that amidst a crowd thousands upon thousands, or worse; a lot of people would unfold one.Nevertheless, I still like it :) I hope it goes in production, It could work for plenty of places, imagine having this on the beach for instance."

"Interesting idea but very poorly designed, it takes 1 person to bump into your bike accidentally and it will go off, moreover it is very easily disabled even by the laziest bike thief and finally you have to set it anew everytime you park your bike since you don't want the risk of it exploding mid-cycle.  I could be a nice deterrent but it definitely needs a better design"

"Hope you didn't waste your money on a laser-razor..Laser won't cut it for shaving (pun intended) It will either be to slow, only able to cut 1 or 2 hairs at a time, or it will be dangerous and drain the battery quicker than you can shave.A laser is a light beam so it will get interrupted by any obstacle, unlike a blade which will happily keep cutting. So you either have to make the beam so strong it takes less then a millisecond to 'zap/cut' a hair thereby using more power and becoming more dangerous or it stays safer limiting power but also sacrificing a lot of cutting speed.Also the skin is never smooth and very flexible, how would you keep that from interrupting the beam while still making sure it cuts close to the skin?"

"Correction/addition:*You shortly touch up on this but quickly dismiss it as to big an issue to even try"

"I'm dissapointed to read this, although I have to agree the idea has flaws and is misrepresented in the renders and models, I feel this is not the glaring omission it's made out to be. Moreover ideas like hyperloop I feel have way larger design issues and that's not stopping it's development.About the supposed issue, by simplifying the issue to a rectangle on rails the option of independently turning wheels is excluded, although this a know solution to this problem. Streetcars have been using it for years. You shortly touch up on this butAbout hitting the guide rails, yeah that could happen if you build them too close, and therefore the idea is misrepresented  in it's renders, but it doesn't do this idea justice to discredit it based upon a visual misrepresentation, while it hasn't been developed since 2012I think that this article would've been a way more enjoyable read if it was an exploration of what was still necessary to make it work, or maybe even proposed as a question to the Core77 community/readers so everyone can pose ideas to solute a possible problem instead of discussing whether the problem is actually a problem."

"apart from the "out of the box" thinking i don't like the usability at all.1. as mentioned, the exhaust fumes would not be nice to do shopping in, especially with fresh produce around.2. if you stay in the car and get al your products through the window, your arm will hurt from lifting/reaching that far away from your body (after several products) (car windows don't sit well in armpits, remember that time you just couldn't reach the ticket machine at the car park from your window? That feeling times the amount of products you want to buy, not good right?)3. you will be annoyed by the speed of the trays, imagine forgetting something at the start after you've gone through half of the thing, walking in back in a normal supermarket doesn't feel that annoyoing, keeping 1 button pressed and waiting for something to come to you, does.4. Products will be hard to find, especially if you put something back on another shelf after deciding you want buy something else. The order of the trays will get messed up5. put back a product but let it stick out from the shelf, the system gets jammed6. if the machines to refill the other machines are first ordered by product, and then completely mixed up, then why sort them in the first place? therefore the top floor is completely unnecessary, moreover you don't want deliveries on your top floor because trucks have heavier loads than cars, making construction harderBut hey, finding problems is easier than finding new and different ways to solve something, so credits to that :)"

"I'm just wondering what would happen if you recieve a call/text during printing? Could you stop the print half way to take the call / answer the text? or do you have to put it on airplane mode?of course a lot of notifications are unimportant, but how would you know? you can't see it"

"As Bastian said, a very common design in Europe (The Netherlands for me), nothing new about them, at least not apparent from this article. Supermarkets even make branded editions and they're available for purchase in a lot of places. In Dutch we call them "klapkrat""