During Additive Manufacturing Europe 2016 a Dutch company Leapfrog presented a prototype of its 3D printer – Bolt. I had also an opportunity to work with a Spanish 3D printer BCN3D Sigma in June. I decided to test this device. When I saw pictures and  a specification of the Bolt, I had a feeling, that it could be an alternative version of the Sigma. I would like to compare them and present you results.

A few years ago the 3D printing industry was just booming, now we can rather talk about its stagnation. I mean machines, which are produced in great numbers, but they are not surprising. 2 or 3 years ago you could have admired a plenty of novelties. When I see a new 3D printer I really rarely get the WOW effect…  I don’t want to criticize anybody, because it is hard to construct a new low-budget FDM 3D printer and it is possible, that you can’t “squeeze” more from that form. Some manufacturers try to oppose this stereotype and create something special like for example: RoVa4D, which shows, how full colour blending 3D printing works.

No wonder, that some manufacturers “take an advantage” from ideas of their rivals. As I mentioned at the beginning, I see a lot of similarities between the both models, but it is only my subjective opinion. Another matter is the fact, that Sander Adam –  the CEO of Leapfrog calls Bolt a revolutionary device…


There aren’t a lot of similarities between them, but some of them are visible with the naked eye.

First of all the construction of the Leapfrog it’s a modified frame of the Sigma. It’s just an inversion. It has a similar design and a touch screen placed at the same place.

The second aspect are two printing nozzles. It is obvious, that the company which implemented two independent nozzles for the first time was BCN3D and this move was a serious revolution! Leapfrog was (?) the second, but its mechanism gives more possibilities, which I will describe later.


The Bolt is equipped with an enclosed working chamber with HEPA filter, which protects against harmful ABS vapours. The device has also meaningfully bigger working area of 320 x 330 x 205 mm, in case of the Sigma it is only 210 x 297 x 210 mm. Moreover the Bolt can work in two modes: replicator mode – using bth nozzles at the same time effectively gives you two printers, what means, that printing the same object multiple times can be done twice as fast; mirror mode – which cuts an orb in half and print both halves… This function requires a bigger working platform, to enable the movement of the both nozzles in the X axis.

An important difference is also type of extruders. The Bolt uses direct drive extruders. The Sigma is equipped with Bowden, what enables working with flexible filaments. Additionally, the nozzle of the Bolt can be heated to 360°C, and the Sigma to 280°C.

As you can see, there are more differences between them, but the question is, if they are differences or just improvements? The Sigma is the best 3D printer according the 3DHubs users. Will Leapfrog  be the next, who will carry off the palm?

Pictures: [1][2][3]

Łukasz Długosz
Enthusiast of 3D printing, new technologies and computer games. Owner of a shop with filaments and 3D printers - filaments4U.com.


    1. One thing: You claim that Sigma (with its Bowden) can print flexible but Bolt (with a print-head-drive) can’t. Sigma pushes the filament and Bold pulls. Pushing a flexible filament is like pushing a rope – not so easy. How come flexible filament is easier to print with “pushing filament machine” than “pulling filament machine”?

      Sigma has 3mm vs. Bolt’s 1,75mm which helps a lot, but otherwise someone might think those two filament feeding systems work differently than you say.

    2. Shitty article if you ask me… Not really based on facts. The BCN fits inside the BOLT. Wonder if you really ever tested the Leapfrog BOLT or only seen it from a distance. BCN is a small desktop 3d printer, where the Leapfrog BOLT (professional) doesn’t compete with at all. How can these two printers be compared? Because of the two heads?

      1. It is only the size you are worried about…? In a matter of fact we tested BCN3D and seen BOLT live during its official premiere during Additive Manufacturing Europe in Amsterdam. We talked to the guys from Leapfrog.

        We haven’t tested BOLT yet, but its not our fault for sure…

        1. In my opinion if you write a comparison article about products, you should have tested both. It’s not only a matter of size, it just doesn’t make sense to compare these two printers, but if you do it, at least do it the right way (put them next to each other and make a photo at least!). They are totally different. The BOLT wasn’t even launched when this article was put online. My advise, get more information before you write about something. You can not write a comparison article based on assumptions!

          1. Is it an excuse for naming it “shitty”?

            1. Weird answer! Good luck!

        2. If you were not able to test it, you should not compare the printers with only having a datasheet. What about the most important thing: software / slicer ? So now you can do it again, BOLT is available now.

          1. First of, you are commenting an article that was published BEFORE Leapfrog BOLT was officially launched. The article represents the opinion of its author about similarities based upon datasheet. There is not a word written in the article, that we have tested the 3D printer.

            Just read the final paragraph: “As you can see, there are more differences between them, but the question is, if they are differences or just improvements? The Sigma is the best 3D printer according the 3DHubs users. Will Leapfrog be the next, who will carry off the palm?”

            Anyway, we are opened for testing it, if we are given a device for tests.

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