Klipper 3D printer firmware

RichM · 30 November 2018 13:33

Interesting approach. As I understand it they are offloading the calculations onto a Raspberry Pi, but leaving the Arduino in charge of the time-sensitive stepper driver stuff. All the advantages of a Smoothieboard without the cost?

@3dtechs @laurent_muchacho

github.com

KevinOConnor/klipper/blob/master/docs/Features.md

Klipper has several compelling features:

* High precision stepper movement. Klipper utilizes an application
  processor (such as a low-cost Raspberry Pi) when calculating printer
  movements. The application processor determines when to step each
  stepper motor, it compresses those events, transmits them to the
  micro-controller, and then the micro-controller executes each event
  at the requested time. Each stepper event is scheduled with a
  precision of 25 micro-seconds or better. The software does not use
  kinematic estimations (such as the Bresenham algorithm) - instead it
  calculates precise step times based on the physics of acceleration
  and the physics of the machine kinematics. More precise stepper
  movement translates to quieter and more stable printer operation.

* Best in class performance. Klipper is able to achieve high stepping
  rates on both new and old micro-controllers. Even an old 8bit AVR
  micro-controller can obtain rates over 175K steps per second. On
  more recent micro-controllers, rates over 500K steps per second are
  possible. Higher stepper rates enable higher print velocities. The
  stepper event timing remains precise even at high speeds which

This file has been truncated. show original

laurent_muchacho · 30 November 2018 16:06

I’ve been following the development and discussion over Klipper, I agree it’s a promising firmware and hopefully will have time to play with it soon. If you interested I’ll happily bring one of my delta and we could play around during one of the 3d evening also hopefully starting in January

In regards to micro stepping I highly recommend this microstepping-myths it explain pretty well where the problem escalate

This is why when building an high end (those are usually a bit more expensive) machine stepper motor with 0.9 degree steps are better than 1.8 degree