Introduzione
You can use this method if you can't eject the stuck disk by the eject button and the eject hole. The PS3 slim on this video is model CECH-300X.
Full video you can see here:
More info about disassembling, you can find in PlayStation 3 Slim Teardown
Strumenti
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Disconnect all cables. You have 4x Torx T8 screws and 7x Phillips screws. Now you can remove outer case.
 
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Unscrew the three screws. To remove Blu Ray unit shell you must open two plates that are on the left and right side.
 
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First remove the spindle disc magnet. Now use plastic tool and slowly extrude the disk from inside.
 
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                            Conclusione
                          
                          To reassemble your device, follow these instructions in reverse order.