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In 2021 we published several articles and showed you errors found in open-source projects. The year 2021 ends, which means it's time to present you the traditional top 10 of the most interesting bugs. Enjoy!

We have previously written about how the Raise3D Pro2 is used for printing surgical guides. In this article, we will talk about intervertebral cages developed and patented by the Pozvonoq startup of the North-West Technology Transfer Center and the Russian manufacturing company Ortoinvest, which specializes in the development and production of power equipment and implants for traumatology and orthopedics.

The .NET 6 turned out to be much-awaited and major release. If you write for .NET, you could hardly miss such an event. We also couldn't pass by the new version of this platform. We decided to check what interesting things we can find in the sources of .NET libraries.

The Bengbu Hospital in the Anhui Province makes use of additive technologies to create medical visuals and guides for vertebrae surgery. Back in 2013, director of orthopedics Niu Guoqi launched the research of 3D printing application for vertebrae, aiming to establish it in-house.

Director Niu’s team and the whole project were the first to apply 3D printing technology for healthcare applications in the Anhui Province. The device they employed was the Raise3D N2 Plus 3D printer from the manufacturer’s very first lineup. The team appears to find it extremely efficient.

“[The Raise3D N2 Plus] printer is the most stable one among all I have tried. The print quality is really good. The surface features of the bone are all recovered in the printed model,” comments Niu Guoqi on the use of the machine in vertebrae surgery, which is one of the most complex and riskiest for doctors.

I reinstalled both Windows and Linux (Fedora) recently on a notebook PC, and I decided to write the summary article about my experience with both OS. I'm also going to describe how to configure each OS via command-line and set up a dual-boot system.

? It's not snowing in my region, but I really like "true" winter holidays ambience, so I made extension for GNOME Desktop Environment so it will snow at least on my laptop.

Not familiar with Linux and/or GNOME? Check out GNOME Project and Fedora OS websites.

Here are extension's GitHub repository and homepage on GNOME Extensions.

The management of a Russian company REC (that’s been developing and manufacturing 3D printing materials for nine years) thinks that the relevance of the additive manufacturing industry will only continue to grow as long as the market will become even more aware of the abilities of the tech.

Hi! I am Aleksey Rybakov, Product Owner at Sber ARVR Lab. 

And before telling you what we have achieved, let me explain the meaning of this article’s heading. Or more so, explain the word “metauniverse”. This term was well-described by Mark Zuckerburg: “Metauniverse is internet implemented, where instead of looking at internet, you are inside of it.” Like a parallel universe, which you can enter yourself with AR/VR gadgets or through a 3D-avatar.

In other words, a metauniverse is simultaneously a virtual space and a way of engaging with its objects without the common “screen + keybord/mouse/sensor” medium. 

And yes, metauniverses are here. But to get into one, you’ll need a few things. First, you need to know where to look. We will talk about that later when depicting a curious case in Moscow. Second, you need a technology that will help connect the virtual world with the real one. We will talk about that as well. 

Now, let me introduce: VPS.

Flipper Zero is an open-source multi-tool for geeks and penetration testers. It so happened that the Flipper Zero project and the PVS-Studio analyzer crossed paths. A philosophical question: should we check the project, if the project developers have already started fixing errors? Let's try to do this.

“This is not even a hypercar — it’s an ultracar,” — this is how race car driver Spyros Panopoulos prefers to call his brainchild, whose company is going to present the most powerful production car in the world, stuffed with 3D printed parts and ready to put to shame Formula 1’s SSC Tuatara and Bugatti Chiron.

It's freezing outside, everyone has already decorated the Christmas tree and bought tangerines. New Year is coming! So, it's time to meet the Top 10 interesting bugs found by the PVS-Studio C++ analyzer in 2021.

Demid Efremov and Ivan Kornienko.

Music box on Verilog HDL for Cyclone IV.

The Swiss manufacturer of professional 3D printers Sintratec has released a software solution called Nesting, which allows for automatic placement of models in additive systems based on selective laser sintering (SLS) technology with optimal use of the build volume.

In the subtropical greenhouse of the Siberian Botanical Garden of Tomsk State University, there appeared 3D printed sculptures of mythological characters — elves, a winged cat, and a baby dragon.

The idea was to create moisture-resistant photogenic sculptures that would complement the exposition of greenhouse plants and draw the attention of visitors to the mythical creatures of the world cultural heritage. 3D models of the sculptures were designed and printed on a 3D printer, being then polished and painted to look like stone.

The research-and-development center of JSC KAMAZ (‘Kama Automobile Plant’) engaged in the creation of advanced vehicle models and improvement of the operational properties of manufactured equipment has recently acquired a CT Mini M vacuum forming machine for their pilot production.

Engineers at the Institute of Mechanics of Moscow State University have designed and manufactured a walking robot using 3D printing technologies with composite materials and aluminum alloys.

Six years ago, we first checked Umbraco with the PVS-Studio static analyzer for C#. Today, we decided to go where it all started and analyze the Umbraco CMS source code.

BASF 3D Printing Solutions launches a new lineup of filaments under the Forward AM brand, which include three options characterized by different composition and hardness — Ultrafuse TPU 95A, Ultrafuse TPU 64D, and Ultrafuse TPS 90A.

Ultimaker has announced a wash machine for removing water-soluble polyvinyl alcohol support structures from FDM/FFF 3D printed products.

Application Programming Interfaces or API’s are responsible for majority of system integration and functional components of modern computing landscape in both consumer and enterprise environments.

Properly constructed secure API’s provide significant benefits during initial build, integration with other systems and during entire application lifecycle while protecting sensitive information stored in business systems.

Based on author's experience designing and implementing API’s for variety of clients in financial, insurance, telecom and public sectors, security is often overlooked in favor of simplistic, vendor/product specific solutions.

This article addresses best practices for API security design in product neutral manner to help architects to plan and build easy to work with and secure API's.

Recommended approach is to separate API security from its business functionality and allow back-end developers to concentrate only on business functions. Once business logic for an API is ready, it can be published using common security components described in this article.

This article does not provide any product specific recommendations, but any modern API security/governance platform will be able to satisfy majority of suggested requirements using out-of-the-box functionality.