UPS 3D Printer Uninterruptible Power Supply – Here are the best

The UPS is a device that connects between the power outlet and the current-powered devices. The ultimate aim is not to interrupt the supply of energy to these devices, through energy stored in their batteries.

The importance of an UPS is easily explained by the possibility of turning off the devices in a “soft” way in case of blackout.

But it’s not its only function. In many cases the UPS also filters the electricity of the network, providing the device with constant energy, filtering any changes in voltage.

These are 2 great reasons to pair it to our 3D printers.



But how does the UPS work?




The operation, is to store energy in their batteries as long as they remain connected to the network, and release this when the energy fails. The duration can vary from 45 minutes to 1 hour and a half.

  • Converter: Converts AC to DC;
  • Batteries: Energy storage to be released in case of Black Out;
  • EMI filters: they cancel any surges and voltage peaks, very useful for electronic equipment (not present in all models).

The UPS, in essence, store energy in the batteries as long as they remain connected to the power grid. When this fails, within a few milliseconds the batteries come into operation, which allow the connected devices to remain in operation for a limited time, usually no more than 10 minutes. This time is normally enough to turn off the device properly, or in case of power failure due to overload to turn off what caused the disconnect and continue the session normally.

UPSHow to choose the UPS for 3D printing

Things get a little complicated around here. To choose the UPS suitable for our needs we will have to consider several factors: Power, functions and sockets available.


The calculation of the power is rather simple, first of all you have to try to have in mind the consumption of the equipment that we want to connect, making the sum.
The only difficulty we encounter at this stage is the different units of measurement, W (Watt) reported on the label on all electrical devices, while the UPS express the power in VA (Voltampere).

The equivalence of the 2 units of measure is in measure of 70%. Therefore the Voltampere reduced to 70% are equal to the Watts. Let’s take a practical example:


I have a device that I want under UPS that indicates in the 500W. Which size should I bet on?

500W / 0,7 = 715 VA

The required group will have a minimum power of 715 VA. Obviously in this case to get to have the stated timing guaranteed you will always have to opt for the largest measure. In this case then at least an 800VA. Abound, as opposed to underestimating, will only bring advantages. With the same costs and functions, always choose the most performing UPS!


The basic function of a Uninterruptible Power Supply Group is to continue with the power supply even in the event of a power outage. Some groups, however, have filters, which cancel out any power surges. This function is excellent for any electronic equipment.

There are several power outages. Among the most common we find the trigger of the life-saver or the exceeding of the maximum allowed power, which gives rise to a detachment.

In these cases, a truncation of the energy emission by the meter is simply verified. The greatest danger is that disallowing a device in full working power could cause damage to its circuits.
Very different are the power grid blackouts, due to different electrical phenomena, these in most cases are accompanied by voltage fluctuations potentially fatal for everything that is connected to the network. In these cases filters can really save us! In case therefore we want the protection of the devices we look in the description for the word “Line-interactive”.



Electrical sockets available

The number of sockets that a UPS must have is a function of the devices that we want to connect, they exist with different solutions. In commerce they go from 3 to 5 medium.
This is a functional choice for the ultimate purpose of the group. If this must protect 1 only thing is useless to search for the maximum of links. It goes without saying that at the same price a solution with more possibilities of connection is always preferable.
Having more sockets makes the UPS more recyclable in case you want to change it for a few tweaks, and maybe reuse for other applications what you were using.

Gruppo di continuità per stampante 3D

UPS for 3D printing.

How easy it is to understand 3D printing is not detached from the general rules so far exposed. There are many printing repair tools available on the market after power failure.
Some implemented in the printer itself, others that can be added to any machine with a Resumer.
So why not just resume and abandon the idea of the continuity group? Simply because the use of the Resumer saves the print, but not the 3D printer.

Many are the cases in which the motherboard does not turn on after a blackout, or maybe it turns on but has anomalies given by the malfunction of the outputs. It’s easy to burn only the exits that were affected by the passage of energy in large quantities. This however makes the card equally unusable and forces us to change it. So we should think of a Group with EMI filters.



Calculate the required power

Let’s start from the assumption that the printer consumes at full speed the energy that the power supply can provide. In most cases this is indicated among the electrical characteristics.
For example, the Creality Ender 3 has a 360W power supply, so this is its maximum power consumption. It may happen that the manufacturer does not indicate the power of the power supply in Watt but in Ampere. So how to transform this value?

Simply multiply the nominal power in Ampere by the voltage used and we will see the Watts.
As an example we can always take our dear Ender 3. 15A power supply with a current at 24V = 15 x 24 = 360W. Same goes for every other power supply. Not only for printers, this method applies to any other electrical and electronic device.

So as mentioned above to find the necessary Voltampere :

360W / 0,7 = 514 VA

It goes without saying that you have to add to the calculation any device we want to protect (PC, Access point, modem, external HDD etc).

What Continuity Group to choose

According to when said so far then which UPS should we choose? We have some choice.

The cheapest

Amazon Basics Line-Interactive

Gruppo da 1500 VA, sufficiente per ogni stampante in commercio. Questi UPS molto economici hanno un limite di erogazione fisico, posto intorno ai 900W, per cui, se sotto stress, per esempio una stampante ed un PC gaming collegati insieme potrebbe non reggere quanto dovrebbe. Un punto a favore però è la protezione dai sovraccarichi e cortocircuiti.

The most performing

AmazonCommercial Pure Sinewave

Compact, powerful, absolutely quiet. It has 8 outputs including 4 under battery and 4 with protection. Excellent in home and small offices. Power output 1100W with 1500VA.

The best compromise


A good choice in the middle. With a declared power of 900W (real) it can hold up to 2 3D printers in print even with the hot plate for 10 minutes. It also has the remodulation of the pseudo sinusoidal wave.
Check our article about Best Cheap 3D Printer: Top 5 in 2021

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