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Halloween Card - Pumpkin

by pasutx, published

Halloween Card - Pumpkin by pasutx Oct 16, 2010

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Summary

In the Bat Mobile (http://www.thingiverse.com/thing:4453) I used a 2D image, converted to a single line which was meant to be drawn by the unicorn pen plotter. I did not plot the image, but printed the image in plastic with 3-5 layers to give it some strength. It is possible to print images like that directly on paper which gives a nice effect for postcards.
Attached a picture of an example how a thin plastic image is printed on a postcard.

Instructions

Images can be printed separately and glued on paper, or printed directly on the paper used as a card. Make sure the first layer is squished a bit. Attached is the gcode file of the pumpkin.

IMPORTANT: Before you print the pumpkin from the gcode file you must edit it. The gcode file is created using scripts to convert from an svg to an gcode file directly. The layer thickness is set to 0.3 mm, but parameters like the initial warm up procedure, possible homing, stopping of the heater at the end etc. are NOT included since this is different for each style of printer and for each material. I use a repstrap printer with makerbot electronics and firmware and PLA. Editing is not difficult. Compare a gcode file you have used successfully for some other print and use the header and tail(!) from that to complete the attached gcode file.
The coordinates used in the file are all positive between 0 and 70. Make sure your initial zero position allows for that.

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Thanks for that. Thus far, I had vectorised one of Robert Bosch's images and then lasered it in 3 mm acrylic. This wowed my students and colleagues. With your link I can now manipulate my own (found) images. Cool

How did you convert the 2d image to a single line?

The single line was created using algorithms created for the eggbot. Basically an image is first converted to grayscale, then converted to a dotted picture where the individual dots visible; many dots near each other for dark areas, few dots further apart for light areas. A special algorithm (a derivative of the traveling salesman algorithm) is used to draw a single line through all the dots. A good writeup with links to the software can be found here.

http://wiki.evilmadscience.com/TSP_arthttp://wiki.evilmadscience.com...

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