Should I buy a 3d printer?

The short answer for many people is "No". The normal house wife / man very likely do not know much about a CAD/3d-program and doesn't have the technical Know How you may need to operate those machines.

For do-it-yourself people and enthusiasts with a little technical talend I would say: If you want one, get one :). As a big-boy toy a 3d printer is still quite expensive but not that much anymore. Some devices are already available for a few hundred bucks and the costs are still going down. But those very cheap once often need more experience or at least will to get them to work right.

The right answer is: If you find it interesting to work a little with your 3d printer and sometime find solutions for smaller problems and just fiddle a little bit with it, a 3d printer is something you will love. It can product really great stuff if you have enough talent and you certainly do not need any kind of diploma to create those small gifts, toys, replacement parts or even own designs.
Just don't buy one if you are just after the end result. You need to have fun on the way too, otherwise it is not worth it.

Because of that many scools have started buying those devices for pupils who want to do it in special work groups and give them the possibility to create things, which never ever before have been there. But you will have a hard time to find them in the "default" subjects. Those are special interest work groups.

Makerbot Replicator 2: My new extruder (small)

 
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You are using Google Chrome...

Do you know that Google is known for not respecting your privacy and using your data without really asking for it?
For instance Chrome will scan your computer and the files you saved on it, transfers data about your internet surfing to Google and creates a extensive profile about you as a Chrome user while combining those data with all other services of Google.

Additional information can be found here: Why you should not use Google products if you can avoid it.

Because of that I highly recommend using another browser:

 
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If my website sucks, you do not need to visit it.
Have a nice day and think about how much you have payed to visit it? Nothing...
How many ads do you see at it? None.

How much money do I earn from it? Nothing.
Does it cost me something to host it? Hell yeah.

I do not see why I should provide it to you to be insulted?