Yesterday we received a very interesting white paper written by Shane Ryan. In this time of day where you come across a new 3D printer release about every week, it becomes more and more difficult to compare and asses the actual value of each printer. As Shane says in his paper, comparison of some aspects is straight forward. For example, build space is usually provided in marketing material and can be easily compared. The difficulty lies in comparing speed, quality and cost.
The paper proposes a test (The Rho Test) that solves these problems by providing the following comparable standard outputs:
Rho Speed – A single number (ρS), a higher number indicates a higher speed.
Rho Quality – Three numbers expressed as percentages:
- ρQS – This reflects the accuracy of the size of the printed object – 100% represents a perfect size
- ρQG – This reflects the precision of the geometry of the printed object – 100% represents a perfect geometry
- ρQF – This reflects the surface finish of the printed object – 100% represents a perfect surface finish
Rho Cost – A single number (ρC), a lower number indicates a lower print cost (this output must be provided with a currency).
Hat tip to Shane Ryan