External perimeter speed

slic3r / Slic3r

Open Source toolpath generator for 3D printers

https://slic3r.org/

GNU Affero General Public License v3.0

3.32k stars 1.29k forks source link

External perimeter speed #3918

Open h5t4 opened 7 years ago

h5t4 commented 7 years ago

Version

1.3.0-dev $ git rev-parse HEAD 1a788196fada65528fc28ced144d9d5c9537412a

Operating system type + version

$ uname -o -s -r Linux 4.10.11-100.fc24.x86_64 GNU/Linux

Behavior

Expected result:

External perimeter is printed slower eg. external_perimeter_speed is smaller than perimeter_speed.

Actual result:

Perimeter speed is is same for all perimeters.

external_perimeter_speed_issue.zip

lordofhyphens commented 7 years ago

You are using autospeed, which tries to maintain constant flow. External perimeters tend to be thinner

ForsakenNGS commented 6 years ago

The external perimiters are always printed at the very end of the layer (or at the very beginning if configured "external perimiters first"), right? Wouldn't it be possible to switch the extrusion speed within the layer once? e.g.:

Print everything except the external perimiters with high speed (e.g. 8mm³/s)
Print the external perimiters with lower speed for better quality (e.g. 5mm³/s)

This way the extrusion amount would still remain very stable, but improve the surface finish potentially by a lot.