3D Printer: The Positron V3 prints upside down and fits in a backpack

The Positron V3 is the perfect 3D printer for makers on the go. Transported in a backpack, it is ready for use within a minute.

 3D printer: The Positron V3 prints upside down and fits in the backpack

After over a year Development work is finished: the positron 3D printer from the maker KRALYN, currently in version 3. With its compact dimensions of 200 mm × 200 mm × 80 mm, it fits exactly into a filament box and can be easily transported in a backpack.

On-site assembly takes about one minute. The device then calibrates itself using an infrared sensor and prints quickly with a build space of 180 mm × 185 mm × 180 mm and up to 250 mm/s. What sounds almost too good to be true, KRALYN has made possible with a few intelligent design decisions.

Different because better

It all started because the maker KRALYN has had enough of the existing 3D printer landscape. In recent years, there have mainly only been iterations of existing 3D printers, as he describes in the Positron V3 introductory video (see below). That’s why he thought of something new: a reliable 3D printer for on the go. The hurdles it faced during development shaped the Positron’s unusual shape.

When the 3D printer is unfolded, the inverted print head immediately catches the eye. With the glass print platform over the hotend, the Positron looks almost like a resin printer, but it actually feeds PLA or PETG filament – ​​to the top. This works very well, as KRALYN shows in its video. The Positron even prints overhangs effortlessly.

The maker justifies the fact that it has moved the print head down because it saves space and stabilizes the printer at the same time. According to KRALYN, the deeper the print head is, the less vibration the 3D printer is exposed to. He was inspired by the Inverted H-Bot 3D printer from LoboCNC, which also prints upwards, but is a lot more expansive. In order to use the largest possible print area in a small space, KRALYN has taken the H-Bot further and arranged the X and Y axes of the positron diagonally to the base area. The axes are moved with the help of Synchromesh (synchronous drive belts), which are thinner than the belts usually used and can be flexibly redirected.

Build it yourself or maintain it

Since KRALYN cannot guarantee the production of the positron itself, it makes all the construction plans of the open source project available on GitHub free of charge to all interested parties. In addition, an assembly video will soon appear on his YouTube channel. Commercial use of the design is allowed and KRALYN even hopes that 3D printer manufacturers will be interested in its design and produce it.


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