T250: Open-source 3D printer produces 3DBenchy in under two minutes

With the T250, Matthäus Szturc presents an open-source 3D printer in CoreXY design, which is designed for maximum speed in the FFF process. Back in 2023, Szturc had already introduced “The 100,” a 3D printer that produced a so-called #3DBenchy, a widely used test model for evaluating print speed and quality, in about three minutes. According to the developer, numerous pieces of feedback from the community were incorporated into the design of the T250. The project is specifically aimed at users who want to test high-speed modifications in the FFF field.

The name refers to a “verified” real acceleration of 250,000 mm/s². As a comparison, Szturc cites a typical desktop printer such as the Bambu Lab A1 with 10,000 mm/s². In this configuration, the T250 prints a #3DBenchy in less than two minutes. For the motion data, the developer specifies 600 mm/s for continuous outer contours and 1,500 mm/s for infill.

Technically, the design is based on a CoreXY system on a very rigid frame. Four motors drive the kinematics. The electrical design is striking: the motors run at 60 volts instead of the 24 volts usual for desktop devices. The higher voltage is intended to enable faster speed changes and push the mechanics closer to their limits.

The second adjustment screw is cooling. At very high speeds, the material remains soft for longer, causing the next layer to start too early. The T250 therefore uses CPAP-like cooling with high air pressure. Air ducts direct the flow around the extrusion zone, and the system also actively cools the motors. A weight strategy is evident in the toolhead: the motor is located at the center of the toolhead as the center of gravity to reduce unwanted twisting during rapid changes of direction.

In addition to the speed focus, Szturc mentions comfort features such as RGB lighting, Klipper firmware, automatic leveling, and a build volume of 192 × 212 × 175 mm. The design data is available as open source. The developer estimates the material costs for construction at a few hundred dollars, plus the effort involved in assembling it according to the instructions.