LESSON 4.1 · 2:04 · CHAPTER 4 · LAYER TIME AND THE WELD
Every layer has a deadline
Too short a layer time and the wall slumps; too long and the layers don't bond. In between is a window, set by how the surface cools.
Predict · at 0:37 in the video
A carbon fibre polycarbonate surface cools as shown. It bonds well between 125 and 165 degrees. Which layer times keep it in that window?
Between about 100 and 165 seconds. The study that measured it found the best result at 130 seconds. At 250 seconds, the surface was down near 89 degrees, and the strength across the layers had more than halved.
Further reading
This course is our own. These books go deeper.
- The economics of Big Area Additive Manufacturing, Post et al., Solid Freeform Fabrication Symposium, 2016
- Additively manufactured carbon fibre-reinforced composites: state of the art and perspective, van de Werken et al., Composites Part A, 2020
About the numbers
Simulations in this lesson are our own. Where a number rests on an assumption or a single source, the video marks it with an asterisk and says where it comes from.
Up next · 4.2 · 2:12Cooling is exponential