Emergency power supply for a 3D printer in a townhouse - how to do it cheaply?

Hello, just after 14 hrs of printing my electricity went down for a while, a few seconds. I live in an old building and this happens quite often during the winter. I am curious if anyone had any ideas on making some kind of emergency power supply ? I have a compact rectifier for the battery for example. However, is it possible to make this fairly reasonably priced ? The power supply for the printer is 260 - 300 watts on average, the amperage I don't know exactly but I assume from 12 amps. Has anyone done anything like this?

You'll mess up and still go buy a UPS

Preferably an uninterruptible power supply like a UPS, the best option in your case. Rectifiers are a game not worth the candle.

It's just that UPS costs money. And is there any noteworthy quality-price ratio ? It would have to keep the power on for a few minutes. Possibly some used ones ? Or another option, I'll pray that my power doesn't die for the next 65 hours as I've just started printing again. Or may the weather not get worse for the next till the end of printing . I will look for offers of a used UPS. But that's tomorrow, as I need to cool off after all the several hours of printing in the trail

For the 3d printer the high was there but for the usp it's gypped? it's your choice I would buy a certain UPS

And there we live.... I made the printer largely myself. And I also bought a large supply of filament recently. I simply have to ration my spending. And unfortunately winter at my place is a hard time. They should lay a new installation and that's the problem. Because there's no heating in the old tenement houses, and when people turn on the electric radiators, it blows out. There is always this problem in winter and nobody does anything about it.... You will have to write a letter to Duda

SamiJa wrote:

just after 14 hours of printing my power went out for a while, a few seconds.

What would be the maximum duration of the voltage backup ?

SamiJa wrote:

Would anyone have any ideas on making some sort of emergency power supply ?

Colleagues have already written , that UPS because it is generally about a smooth transition from mains to emergency power without interruption.

SamiJa wrote:

Powering the printer is on average 260 - 300 watts, the amperage I do not know exactly but I assume from 12 amperes

With 300W and powering the whole device 230V AC the current drawn is about 1.3A AC.

SamiJa wrote:

Has anyone done something like this ?

As there are skills + material and time it can be done.

SamiJa wrote:

Only that UPS costs money. And is there any noteworthy quality-price ratio ?

And it depends, because a new 300VA is from about 250PLN upwards and in the promotion it is even possible to get for 120PLN.

SamiJa wrote:

I will look for offers of used UPS

It seems to me that this is the best (cheaper) solution. However, you have to reckon with the fact that their batteries are rather poor (although you can check this before buying) and the cost of a new gel battery 12V/7Ah (depending on the power of the UPS) is 45zł-85zł.
If you have a used UPS, you may be tempted to connect a larger battery to the outside - it will last longer, but you will then have to solve the problem of charging it, as the UPS is designed to charge a smaller one.
Finally, one more important note: what requirements does the 3D printer have with regard to the power supply? The point is that most low-cost UPSs (approx. PLN 250) have 230V AC output, but in rectangular form, and some electronic devices like to be supplied with sinusoidal voltage.

The price of a used one with a new battery is around 100-150pln

What voltage does the printer need at the output of the power supply?
Maybe instead of going for a large UPS with batteries, a back-up for the control unit and automatic stopping of printing when the mains power fails is sufficient. The heater has inertia, when the power supply fails it will probably still be heating for a few tens of seconds and it is enough for the controller not to reset....