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Bas De Bruijn decided to spped up his 3d printer and made some tweaks in MachineKit and LinuxCNC.He made following adjustments_
- Changed the configuration files so that LinuxCNC calculates speed of the extruder based on the nozzle speed (the extruder axis is velocity controlled instead of position controlled).
- Added functions for setting width of the line being extruded and the height of that line (the current layer).
- (Un)linking of the extruder with the nozzle velocity.
- Write scripts that post processes the slicer g-code output (remove all A-axis positions) and insert the dimensions into the g-code.
Here is the video with the results:
From video description:
This is the first output of extruding without the E or A axis. The velocity of the extruder is linked with the velocity of the nozzle.
Width of the line (perimeter/infill) and height of the layer are set from the g-codes, and LinuxCNC calculates the correct cross section to be extruded.
When there is a traverse move (no extrusion) then the velocity is disconnected from the nozzle velocity.
Here is the photo of the results in comparison to normal settings:
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| "Normal" extruding is on the left and the "pressure adjusted velocity controlled extrusion" is on the right. |
Project homepage with much more detailed information if you want to do it yourself:
http://basdebruijn.com/2014/05/machinekit-and-additive-manufacturing/
All the files can be found at: https://github.com/luminize/machinekit/tree/vel-control-extruding
Bas used this software upgrade to implement 3d printing with guided slew ring wire embedding.
Update (26.9.2014.):
New improvements with velocity extrusion technique and new speed, acceleration and deceleration calculations .
http://basdebruijn.com/2014/09/velocity-extruding-revisited/
