Ruled Surfaces with Silkworm

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Some tests done with Silkworm based on parametric line geometries generated with a simple  grasshopper definition. The principle is to create a solid structural outer shell which supports inner lines that span between different points of the perimeter. The inner lines define a ruled surface while the outer shell is a prism with an n-sided polygonal base.

Grasshopper Script 01

 Use the definition above to generate uniform ruled surfaces:

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Grasshopper Script 02

 For more customization options and to get non-symmetrical shapes, the definition above can be used:

001

And more examples below using the same technique, printed on a Mendel Max 3d printer in PLA :

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OLYMPUS DIGITAL CAMERA

Defining your Slic3r Settings for Silkworm

What are Slic3r settings and how can you find out if they are right?

The Settings component of Silkworm

First of all what is Slic3r?

Slic3r is a free software that converts a digital 3D model (in STL format) into printing instructions for your 3D printer (in G-Code).

 

Why are settings important?

Settings are included in the 3D print Gcode and defines many of its parameters such as speeds, layer height or support materials. Silkworm includes these settings within its final G-Code.

 

Is there any resources out there on Settings?

Here are some blogposts which were really useful for us (we use RepRap Prusa Mendels):

How low can you go: http://richrap.blogspot.co.uk/2012/01/slic3r-is-nicer-part-3-how-low-can-you.html

Slic3r Documentation: https://github.com/alexrj/Slic3r/wiki/Documentation

Examples: http://forums.reprap.org/read.php?262,107168

Tips: http://www.lpfrg.com/faqs/4-2-adjusting-slic3r-settings/

Notes on tuning a slic3r profile: http://www.buildlog.net/forum/viewtopic.php?t=1185

On Layer Height: http://blog.reprap.org/2011/12/001-layer-height-on-prusa-mendel.html

Setting the flow rate: http://solidoodletips.wordpress.com/2012/08/16/setting-the-flow-rate/

Some makers share their settings on their blog, have a look at the following ones:

http://brazenartifice.wordpress.com/my-slic3r-config-file/

http://the3dprinter.blogspot.co.uk/2012/03/slic3r-settings.html

 

How can I check my G-code:

You can use the Silkworm Viewer (post on this soon).

You can also use the following online G-code viewers:

http://jherrm.github.com/gcode-viewer/

 

We also share our Settings:

Download Arthur’s Quality 3D Print Settings.

 

Important notes:

  • Fill density: from 0 to 1 (0 is less density and 1 is higher). A higher fill density will make your product stronger.
  • Top/Bottom fill pattern: Make sure to have a concentric Top and Bottom pattern, otherwise the cross-hatch will be visible on both sides (see image below).
  • Perimeter: Don’t forget to have at least 1 Perimeter otherwise the infill cross-hatch will be visible on the edge (see image below)
lowres2

Above: No Top/Bottom concentric pattern so cross-hatch is visible on top and bottom face. No perimeter so cross-hacth visible on edges too

  • Refraction Speed: This is the speed at which your filament retracts when it reached the end of a path. When your edges are not clean (image below), you refraction speed is probably too low.
lowres

Above: Blobs on the edges due to a Refraction speed that is too low (5mm/s), aim for 60mm/s

  • Enable cooling: Plastic likes to cool down a little before the next layer is deposited. Slic3r has provisions for cooling built-in, and they are in the “cooling” tab. The first thing to do is check the “enable” box (even if you don’t have a fan.