3D printer for production?

I agree with Tomek....the money to be made on a printer isnt really in printing.  Its more in design and "custom" work.  If its a run of the mill Iphone case you wont make that much and its not really worth your time.

But, talking about cheaper printers, what do You recommend?

One reason to go with a Makerbot (or clone) is the Sailfish firmware, written by a user.   It can drive the printer very fast while maintaining quality.  If you want to use the printer for production, speed is going to be one of the most important qualities because 3D printing is slow.   Ultimaker is another one that can print well at high speed.

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Without having a multi color printer, without doing acetone vapor baths, without hand painting at least some details on the case I am not sure how it will be SWEET! enough to get $15 for it. Maybe your market is different than mine here. Though I don't use the oh so stylish and trendy iPhone and I do not use a case for the android jelly bean phone I do have.

timmu.toke, I'm planning to make something like your idea and I Agree with techbuilder.
You'll need make mold and cast. Take a look on smooth-on com (there is many kinds of materials for cell case and tuts).
Do you know Form 1 from Formlabs? I think that is you best choice for your purpose. 3d SLA printer with 25 microns. More resolution, smooth surface and with a Pro looks.

I'll wait until march-april 2014 to buy Form 1 or another with same specs.

I have a replicator 2.  I love my machine, it is an excellent item.  My friend has the solidoodle 4 and it seems identical to my machine but his prints in ABS and mine in PLA unless I go buy a heated build plate upgrade.  They're a little different in design, but in operation they function exactly the same.

That being said, I paid $2,100 for mine, he paid about $1,000 for essentially the same thing.  He has the ability to print in ABS plastic which is what I would suggest you use if you want to sell cases since a PLA case will melt if left in a car in Arizona in the summer.

Then you have to know how to design unless your plan was to just download STLs from websites and print them to sell which is against all the policies of every site that shares STLs in the first place.

I've printed a couple of phone cases for my phones and I don't like how they come out at all because the plastic is not flexible.  In fact, some designs break when you try to remove the phone from the case.  You can use the flexible filament, but it's a lot more expensive, you have to print much slower and it's harder to use.

Then you have to figure what price point you want to sell at.  In PLA at 100 mm/s extrusion, 150mm/s travel speed a case for a galaxy s3 takes about 2 to 2.5 hours to print.  Flexible filament is difficult to use and takes even longer since you have to slow the print speed down.  You are not printing an otterbox, so you might be able to sell a case for $19.99 if you're lucky and they won't fly off the shelf at all because anyone can go anywhere and get a cheap case.  It could take you upwards of over 5 hours to print the case in the correct material.

So if you're plan is to make money with a 3d printer selling phone cases, I would say no it is not a good idea.  If you are good at design at all and network with people, you could offer a prototyping service to shops so you have a fast turn around time for them, but network before you buy!

If you want to get this for a hobby and make a little money on the side (I.e. you're not buying it with the intention of making sales to pay it off) I think it would be good because then you don't have your expectations set for something that is not likely to happen.

I think resin-casting would be a low-cost option for this - silicone and polyurethane casting resins are widely available (try art and hobby shops to start with), and if you use the right low-viscosity product and design the mold well you may get some quality looking stuff without needing vacuum equipment.

Wait, do you guys pour liquid resin into the molds or do you mean making the molds from resin (how)?

Why resin? Lower melting temperature? What kind of resin?
This is really interersting