Scrappy: Using Scrap Material as Infill To Make Fabrication More Sustainable


We present a software system for fused deposition modelling 3D printing that replaces infill material with scrap to reduce material and energy consumption. Example scrap objects include unused 3D prints from prototyping and calibration, household waste like coffee cups, and off-cuts from other fabrication projects. To achieve this, our system integrates into an existing CAD workflow and manages a database of common items, previous prints, and manually entered objects. While modelling in a standard CAD application, the system suggests objects to insert, ranked by how much infill material they could replace. This computation extends an existing nesting algorithm to determine which objects fit, optimize their alignment, and adjust the enclosing mesh geometry. While printing, the system uses custom tool-paths and animated instructions to enable anyone nearby to manually insert the scrap material.

Ludwig Wilhelm. Wall
University of Waterloo, Waterloo, Ontario, Canada
Alec Jacobson
University of Toronto, Toronto, Ontario, Canada
Daniel Vogel
University of Waterloo, Waterloo, Ontario, Canada
Oliver Schneider
University of Waterloo, Waterloo, Ontario, Canada




会議: CHI 2021

The ACM CHI Conference on Human Factors in Computing Systems (

セッション: Fabrication

[A] Paper Room 08, 2021-05-12 17:00:00~2021-05-12 19:00:00 / [B] Paper Room 08, 2021-05-13 01:00:00~2021-05-13 03:00:00 / [C] Paper Room 08, 2021-05-13 09:00:00~2021-05-13 11:00:00
Paper Room 08
12 件の発表
2021-05-12 17:00:00
2021-05-12 19:00:00