"Huh? Was it just cash? Gou Ke thought that what he had pulled out this time was some strange thing, but it turned out to be just an ordinary box of 100 yuan in denomination. It's not that this thing is not rare, but compared to the magical man in front of him, even if the amount of RMB is large, it is really ordinary.

The strange man smiled and said, "That's right, it's just the currency used in your time. In order to prepare for the end times, you need to hoard a lot of supplies, which is the start-up capital to support your hoarding, although the printer itself can make you rich, but this thing needs a lot of energy to run at full strength, which is not supported by the kind of home circuit you are using now. But remember, you need to strictly limit the technology I gave you to your own use, otherwise it will have serious consequences."

"So, put away the printer and the currency, and reach over," the strange man said with a smile, but without waiting for Gou Cao's consent, he directly pulled Gou Cao's left hand over, and then shook Gou Cao's wrist hard. The strength is quite large.

Gou Cao withdrew his left hand and found that there was an extra black ring-shaped "tattoo" on his wrist. As if instinctively, Gou Cao put the palm of his left hand against the water cup, and the water cup was included in the tattoo, and then Gou Cao concentrated on taking out the water cup and holding it in his hand. This should be a subspace storage device.

"Thank you." This was intended to be said to the strange man, but when he looked up after fiddling with the subspace storage device, the man had already disappeared.

However, before Gou Cao could react from his bewildered state, the doorbell went up again.

Gou Cao put all the things left by the strange man into the subspace storage device, and then calmed down and went to answer the door, and found a person standing outside the door with a bunch of circuit detection and repair tools. "Hello, are you registered to live here Mr. Ke, I am the circuit maintenance staff of the community property, half an hour ago the circuit of this unit was overloaded, and the electricity record shows that it is caused by the abnormal increase in power consumption on your side, can you understand what is going on?"

"It's gou, I haven't violated the household circuit use specifications, and I don't know about circuit overload." The 3D printer can't be shown to others, so Gou Cao has to pretend to be stupid.

"So, can I check on the electrical equipment in your room?" Although the maintenance staff looked calm, it was clear that they could not be fooled by just one sentence. But Gou Ke was not afraid of his investigation, so he was very cooperative, "Yes, please." ”

After more than an hour of careful inspection, except for the abnormally high value of the electricity meter, no traces of illegal electricity consumption were found, and no electrical appliances were found to occupy enough power to trip the entire unit circuit in a short period of time. Therefore, even if the maintenance personnel are full of suspicions, they can only be temporarily treated as a circuit short-circuit. This is where the convenience of being a lawyer comes in, and since the profession itself is very good at getting things done, most people and organizations won't be too embarrassed if they don't have a good enough reason (except for the tough guys in the Justice Bureau).

The power supply was quickly restored, and the trouble caused by circuit overload was just a small episode, but it also reminded Gou Cao that although the 3D printer given to him by people in the future is very easy to use, it is very problematic to use concealment, and such a large amount of energy will always be found to be wrong. But this thing just can't be known. Damn, he needs to be calm the most at a critical moment, but there are too many clues that need to be sorted out by him.

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I took a good bath with cold water, made a cup of tea with hot water at a moderate temperature as usual, and fiddled with the 3D printer and subspace storage equipment for a while. The mind finally began to digest the amount of information received today, and he sat down in front of the computer and began to write down the questions that must be considered now:

1. Concealment issues. According to the requirements of the people of the future, the preparations for the end of the world must be kept hidden, and the 3D printer and the future technology products it produces must not be visible to outsiders. However, there are many people in the community, and the landlord and the property in the community may also come to inspect, and if they continue to stay here, the concealment will not be guaranteed.

2. The problem of power source. The power of 3D printers is quite large, which is not something that ordinary civilian circuits can load. Even if the load on the circuit is reduced at the cost of reducing the production rate, abnormal power usage can attract unwanted attention. One pimp was arrested because he was investigated by the police for opening a women's branch in his home, which caused abnormal electricity usage. Although Gou Ke was not prepared to do anything illegal, the police investigation itself was very troublesome.

3. Material purchase issues. Food and water were nothing. However, it is difficult to buy medical products and fuel in large quantities through regular channels, and the purchase of prescription drugs is quite limited, and fuel is not directly added to the car mailbox but is used in other containers, and real name registration is required. Moreover, once these two things are purchased in large quantities without wiping their tails clean, they can easily be targeted by the anti-drug and anti-terrorism departments.

4. Material reserves. Even if it can solve the third problem above. Material reserves also need a certain space. The maximum storage capacity of the subspace storage device is 10,000 moles, which is converted to 180 kilograms if it is used to store pure water, and 560 kilograms when it is used to store pure iron, which is completely insufficient. As for the reserve materials with more complex molecular composition, the conversion process is naturally quite troublesome, and Gou Cao doesn't plan to calculate it, after all, he reported to the law back then because he was not good at mathematics, anyway, this thing on his wrist can only be used to store accompanying items, and he needs to prepare another place to hoard other materials.

5. The problem of security after the end of the world, now that Gou Cao is in a densely populated area, after the end of the world, zombies will be rampant, and he can't stay for a long time, so he needs to find a place that is easy to defend to establish a settlement. In addition, Gou Ke must also prepare self-defense weapons, the zombies are terrifying, but on the other hand, the threat from other survivors may not be underestimated.

6. The problem of resource production after the end of the world. No matter how many resources are stored before the end of the world, if they are not replenished after the end of the world, they will still be exhausted, and sustainable resource production facilities are still necessary.

That's all for now. After drinking a cup of tea that was about to cool down, Gou leaned back in his chair and looked at the ceiling, and began to think about what to do next.