Copenhagen-based design studio Oberdoerfer & Krebs is challenging the limitations of additive manufacturing by introducing manual post-print processing to 3D-printed furniture. By combining programmed toolpaths with heat-assisted hand-bending, the studio’s Bend Chair and Bend Stool projects move beyond the static, side-profile extrusion common in current 3D-printed design. According to the designers, this hybrid approach allows for complex structural forms that prioritize material behavior over rigid digital geometry.
How Manual Intervention Reshapes 3D Printing
Most large-scale 3D-printed furniture relies on a fixed, continuous silhouette created by a printer moving on its side. Oberdoerfer & Krebs, founded by Jasper Krebs and Bruno Oberdoerfer, disrupts this workflow by integrating “bend zones” directly into the toolpath. As reported at the Ukurant exhibition during 3daysofdesign, the duo prints these objects with specific sections designed to be reheated. Once the material is pliable, the designers manually bend the pieces into their final shape. This technique allows the furniture to retain a unique tension between the machine’s programmed geometry and the physical force applied by the maker.
Why Material State Matters More Than Material Change
The studio’s research into expandable filaments, specifically colorFabb LW-PLA, suggests a shift away from swapping materials to achieve different structural properties. By adjusting temperature and printing strategies, the duo forces the middle layers of a print to foam, altering the object’s weight and rigidity. According to the designers, this allows them to design through “material states.” This method contrasts with traditional industrial manufacturing, where changing a product’s physical behavior typically requires a complete shift in material composition or tooling.
Can Accidental Forms Become Functional?
In their UpsideDown project, Oberdoerfer & Krebs explore the intentional use of printing “failures.” By commanding the printer to move off-path mid-process, the nozzle extrudes plastic into open air, creating sagging loops. Once the material cools and the object is inverted, these structural errors function as hooks. This approach reframes the role of the machine, turning the printer from a tool of absolute precision into one that facilitates controlled improvisation.
Integrating Textile Logic into Pellet-Extrusion
For the Biennale for Craft & Design, the studio applied textile-inspired logic to vessel-making through their Human Layers project. Inspired by the ikat dyeing technique, the duo developed a method to manually inject tinted PLA pellets into the extrusion process at specific, calculated intervals. This “material choreography,” as described by the studio, requires the designer to act as a live participant in the print, ensuring color transitions occur at precise points to create patterns. This effectively bridges the gap between high-tech pellet-extrusion and traditional craft, where the rhythm of the maker dictates the final aesthetic.

FAQ
- What is the primary benefit of post-print bending? It allows designers to create shapes that are physically impossible to print in a single pass while maintaining the structural efficiency of 3D printing.
- Does manual bending weaken the plastic? According to Oberdoerfer & Krebs, reheating specific zones allows for controlled manipulation without compromising the integrity of the print, provided the toolpath is programmed with the bending process in mind.
- Is this process scalable? While currently focused on exhibition work, the studio’s findings demonstrate a methodology for “hybrid manufacturing” that could potentially be integrated into small-batch furniture production.
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