{"id":3519,"date":"2022-04-12T11:01:04","date_gmt":"2022-04-12T11:01:04","guid":{"rendered":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/?p=3519"},"modified":"2022-04-12T14:09:49","modified_gmt":"2022-04-12T14:09:49","slug":"large-assignment-4-g-code-yie-sheng-chen","status":"publish","type":"post","link":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/2022\/04\/12\/large-assignment-4-g-code-yie-sheng-chen\/","title":{"rendered":"Large Assignment 4 – G-code – yie-sheng chen\u00a0"},"content":{"rendered":"\n

Description of my process<\/p>\n\n\n\n

My code uses Prof. Leah and Franklin’s “extruder-turtle-Rhino” library to generate g-code. Particularly, all my three prints uses are based on the fiber bridging technique which cannot be generated by a traditional slicer. My code for the first 2 prints, 8x5x5 chessboard and 3d maze, first deposits a layer of the base shape and it set penup and went through the shape again and make a fiber bridge at designed locations. My third print, prototype of a kinetic sculpture, make a fiber bridge at designed locations at the same time as the base shape is deposited. For this 3rd print, my code mimic the draw method of the L system.<\/p>\n\n\n\n

In the beginning I have no idea what cannot be generated by a traditional slicer so I started by reading through the references. I am attracted to the bridging technique in “3dprint.com\/32480\/3d-print-paintbrush-bridging\/”. However there is only text description but no code. I then went on to read the “Extruder-Turtle” paper by Prof. Leah and Franklin. <\/p>\n\n\n\n

The “Extruder-Turtle” paper analyzed very clearly what cannot be done by traditional slicer. Having a clear idea, I began with examples at Franklin’s webpage. However, some variable definition is missing. Luckily, there is complete demo code at the github repo. But when I tried to run the examples, first, the Rhino viewport showed no lines, then, “cardioid.py” resulted in strange turtle path. Prof. Leah again generously helped me solved both problem: Grasshopper’s python block output “out” cannot be used to display geometries and “cardioid.py”‘s radians have to be changed to degrees.<\/p>\n\n\n\n

I am relieved to be able to print the “cardioid.py” generated g-code which have the fiber bridging technique. After first, I got several string art ideas: boat in a bottle, tree houses, etc. But I soon realized and recalled what the “Extruder-Turtle” paper’s “Discussion” section said: “Turtle Geometry\u2019s emphasis on local movement makes it difficult to design prints with complex geometry that lack convenient symmetries or simple low-level descriptions”. <\/p>\n\n\n\n

Fortunately, I was able to come up with some interesting ideas to design and print: an 8x5x5 “3D” chessboard, a 3d maze, and a prototype inspired by the kinetic sculpture called “Exercise in Frugality” by artist George Rhoads at Boston’s Logan Airport. <\/p>\n\n\n\n

Challenges I encountered<\/p>\n\n\n\n

One is there are unexpected blobs of filaments forming on my kinetic sculpture print. I made sure I didn’t repeatedly deposit filament at the same height. Later I found I do too many pendown which might result in many positive extrusions (E3).<\/p>\n\n\n\n

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result of too many pendown<\/figcaption><\/figure>\n\n\n\n

Shape 1: 8x5x5 chessboard<\/p>\n\n\n\n

I have been trying to come up with an implementation of “3D” chess for a few years. It’s really a nice opportunity for me to see what an actually 3D chessboard might look like. It’s very difficult to place any chess pieces onto this chessboard design. One idea is to let one corner be a pivot to let player rotate away layers to reveal the layer they want to access. But even this way the center pieces will be occluded.<\/p>\n\n\n\n

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g-code file in Cura<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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rhino perspective view<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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rhino top view<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Shape 2: a 3d maze<\/p>\n\n\n\n

I was imagining a tree house with stairs and floor layouts. But I think this 3d maze concept is a good starting point. It’s a maze where participants can only access the immediate lower level. So people in this maze have to go to the point of the intersection between current and lower levels.<\/p>\n\n\n\n

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g-code file in Cura<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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rhino perspective view<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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rhino top view<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n
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Shape 3: an “Exercise in Frugality” inspired kinetic sculpture prototype<\/p>\n\n\n\n

I prototyped some elements for a kinetic sculpture of bearing balls rolling inside it. There are horizontal rails to let the bearing balls travel and stairs to let the balls pick up speed. And I think the vertical column is needed to connect rails to different directions. However the position of the columns has to be adjusted.<\/p>\n\n\n\n

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g-code file in Cura<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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rhino perspective view<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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rhino top view<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n
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a close up of the step fibre bridge to let ball bearing picks up momentum before entering a horizontal trail<\/figcaption><\/figure>\n\n\n\n

elements not printed and some images of the original kinetic sculpture from George Rhoads:<\/p>\n\n\n\n

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bearing balls from Amazon https:\/\/www.amazon.com\/Litorange-Precision-Assorted-Bicycle-Assortment\/dp\/B09CPQ4RYF\/<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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an photo of the original kinetic sculpture at Logan Airport<\/figcaption><\/figure>\n<\/div>\n\n\n\n
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video and article about this kinetic sculpture: https:\/\/rumble.com\/vbyu75-kinetic-sculpture-at-logan-airport.html<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

<\/p>\n\n\n\n

Other thoughts<\/p>\n\n\n\n

I was introduced this paper while reading the “Extruder Turtle” paper and wonders if it’s possible to implement WirePrint in “Extruder Turtle library”. (Stefanie Mueller, Sangha Im, Serafima Gurevich, Alexander Teibrich, Lisa Pfisterer, Fran\u00e7ois Guimbreti\u00e8re, and Patrick Baudisch. 2014. WirePrint doi.org\/10.1145\/2642918.2647359)<\/p>\n\n\n\n

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a screenshot of the paper : https:\/\/dl.acm.org\/doi\/pdf\/10.1145\/2642918.2647359<\/figcaption><\/figure>\n\n\n\n

My .gh code : https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-content\/uploads\/2022\/04\/YieshengChenLA4.gh<\/p>\n","protected":false},"excerpt":{"rendered":"

Description of my process My code uses Prof. Leah and Franklin’s “extruder-turtle-Rhino” library to generate g-code. Particularly, all my three prints uses are based on the fiber bridging technique which cannot be generated by a traditional slicer. My code for the first 2 prints, 8x5x5 chessboard and 3d maze, first deposits a layer of the base shape and it set penup […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-3519","post","type-post","status-publish","format-standard","hentry","category-large-assignment-4-g-code"],"_links":{"self":[{"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/posts\/3519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/comments?post=3519"}],"version-history":[{"count":3,"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/posts\/3519\/revisions"}],"predecessor-version":[{"id":3564,"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/posts\/3519\/revisions\/3564"}],"wp:attachment":[{"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/media?parent=3519"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/categories?post=3519"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/handandmachine.org\/classes\/computational_fabrication\/wp-json\/wp\/v2\/tags?post=3519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}