2m "wooden" Leaf Bridge printed with UPM Formi 3D biocomposite to Pori Housing Fair 2018 by project Juniper.
Project Juniper brings together several of Finland’s leading technology players from the field of additive manufacturing: UPM Biocomposites, 3DStep Oy, Suunnittelukide Oy, Simons Element Oy, Tampere University of Applied Sciences (TAMK), ROP Artist Group and Business Finland. Since autumn 2017, the project group has been investigating how large structures can be printed with wood-based materials and how to copy features from the nature (biomimicry).
Project coordination by 3Dstep Oy
Leaf bridge concept by ROP Artist Group
Contraction detail design by TAMK
Strength calculations by Suunnittelukide Oy and TAMK
Printing by TAMK
Materials by UPM Biocomposites / Octofiber
Assembly by Suunnittelukide Oy and ROP
Housing fair arrangements by Simons Element Oy
Finance in collaboration with Business Finland
The Leaf Bridge vas printed in total of 17 parts and hase size of ~2m x 80cm x 80cm.
Weight of the bridge is 93kg.
Print your own Leaf Bridge in 1:10 scale.
1mm layers, 2,6mm line widht
Printed with two types of 3D printers at Tampere University of Applied Sciences (TAMK).
1) Conveyor belt- type printer capable of printing components up to 500mm wide and unlimited length.
2) ABB robot arm incorporated with printer head
Filaments used for the project:
2,85mm UPM Formi 3D filamens produced by Octofiber
2,85mm UPM Formi 3D filaments produced with 3DevoNEXT desktop extruder
The advantages of UPM Formi 3D 20 over traditional 3D printing materials made it the clear choice as the material for the project. 20% of fine cellulose fibres in the biocomposite material facilitate large scale printing.
Beneficial properties of UPM Formi 3D for large scale printing:
- Extremely low shrinkage
- Fast cooling
- Self-supporting molten stage properties and shear thinning melt flow enable large elements to be produced efficiently
for more info visit: www.upmformi.com/3D
Print settings for 1:10 model:
FFF: 0,4 - 0,8mm nozzle is fine with standard print settings
The beam of the bridge was printed in 10 narrow sections which were assembled with glue and secured with crosswise threaded steel pull bars and nuts to form a complete bridge beam. The leafs acting as railings were also printed as several hollow sections. Before gluing the leaf sections on to the side of the beam, the sections were filled with polyurethane foam to resist buckling. There is glued groove and tongue joint between the railing and the beam, whereas the railing sections are only butt jointed together with glue. Water-resistant polyurethane wood glue was used.
The bridge parts were painted with tinted alkyd primer paint before assembly. After assembly, a second layer of the primer was applied. To prevent slipping, the footway on the bridge was painted with the primer mixed with additional non-slip granules. The final colours and surface was applied as several layers of acrylic spray.
Leaf image used under license from Shutterstock.com