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      "body": "Congratulations @virtualabs! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@virtualabs/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@virtualabs) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=virtualabs)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/7CiQEO.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\">SteemitBoard - Witness Update</a></td></tr></table>\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "body": "I have to admit it sounds a bit weird to \"code\" a 3d part, but it is really powerful. From a person like me who learned C, it's easy to conceptualize a part as a flexible module you can call in a bigger project, like we usually build a complex program in C. \n\nThe OpenSCAD editor allows real-time visualization of what you're doing/coding, so it is not so hard to see where you're going while coding.",
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      "title": "A cool spool holder for your 3D printer =)",
      "body": "I started to build my Prusa i3 printer a few years ago, from scratch, buying pieces and pieces on eBay and Amazon. It took me one year and a half to build it, and here it was ! After some days spent on calibration, I started to print some designs I found on  the Internet, until my plastic filament spool got jammed because I did not have a spool holder.\n\nLooking for the best spool holder\n---------------------------------------------\n\nAfter having spent many hours on Thingiverse,  I was not satisfied as every spool holder I found requires some screws or some weird assembly. This is why I decided to create my own that does not need screws and will be easy to assemble. I drew some designs on a piece of paper, and quickly came to this solution:\n\n<center>![spool-holder-prototype.png](https://steemitimages.com/DQmc8BwDabMFzhHwG9DwxEve8Md5NiCSLZiMCRxuQqukwRN/spool-holder-prototype.png)</center>\n\nThis spool holder works thanks to the gravity and a few 608ZZ bearings (I had many of them because this kind of bearings are sold by 10 whereas my printer only required 3 of them). The design is damned simple: a circular plate is placed on 3 bearings, hold by a single piece of printed plastic with absolutely no screws or weird assembly ! A circular ring is placed on the plate and maintained in position with 4 notches, allowing various spool diameter to be put on this holder.\n\nAllright, I got the idea, but how the hell do I create the 3D model for all these parts ? It was the start of my journey in this happy world of designing 3D parts.\n\nCoding rather than drawing\n-------------------------------------\n\nMany people uses Sketchup or any similar software (really good CAD softwares anyway), but I thought it would be interesting to dive into OpenSCAD, an opensource 3D part designing software. This software is like no other: you don't draw your part, you program it !\n\nI created my first SCAD program and design all the parts I needed. Here is the source code of the plate as an example:\n\n```\n/**\n * Spool support.\n */\n \n /* Import stand.scad for config values. */\n use <stand.scad>\n \n plate_bottom_radius = 38.2;\n plate_height = 7;\n plate_top_radius = plate_height*tan(45)+plate_bottom_radius;\n \n module spool_support(spool_diam=52){\n    difference(){\n     difference(){\n         union(){\n            cylinder(h=plate_height, r2=plate_top_radius,r1=plate_bottom_radius, $fn=200);\n            translate([0,0,6]) cylinder(h=1, r1=plate_top_radius+10.0, r2=plate_top_radius+10.0, $fn=200);\n         }\n         translate([0,0,-0.2]) cylinder(h=plate_height+1, r1=19, r2=19, $fn=200);\n         translate([0,0,-0.2]) cylinder(h=plate_height-1.3, r1=plate_bottom_radius-2, r2=plate_bottom_radius-2, $fn=200);\n         \n         for (i=[0,90,180,270]) {\n            rotate([0,0,i]) translate([spool_diam/2 - 2.5,0,5.4]) cylinder(h=2, r1=1.6, r2=1.7, $fn=200);\n         }\n     };\n    cube([90,90,7], true);\n    }\n }\n \n spool_support(spool_diam=52.8);\n ```\n\nBy using OpenSCAD, I was able to automate some tasks and create a quite complex design by simply doing math and code :). \n\nFinal design of my spool holder\n------------------------------------------\n\nAfter some tests and improvements, here is the final design I came with:\n\n<center>![final-spool-holder.png](https://steemitimages.com/DQmaENtd3H8LoPSofPjumhbprAA6vGodGZQFwsubEkwyLHo/final-spool-holder.png)</center>\n\nAnd a picture of this spool holder I'm currently using with my 3D printer:\n\n<center>![real-spool-holder.jpg](https://steemitimages.com/DQmZEPqkamnCV5vgKi9qw44XC4114zfAN4cbPhGMQH9EP5a/real-spool-holder.jpg)</center>\n\nWant to print it ? It is available from Thingiverse: http://www.thingiverse.com/thing:1269036\n\nIf you want to learn more about **OpenSCAD**, the [online documentation](http://www.openscad.org/) is pretty amazing ! (These guys create gears and much more complex designs by only coding !!)",
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