Corner Bricks OpenSCAD Module Lego Angled Brick Builder
by kresty, published
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L3-G0's main body consists of a barrel of 12 plates at 30 degree angles. I was using Lego hinges, which worked, but flex and weren't completely sturdy. So I made this library to create ~48 filler hinges to help L3-G0 keeps his shape.
The lettering is just because I could, and to show it was originally designed for my L3-G0 robot. https://youtu.be/wdFkKSe0ZX0 shows some video of L3-G0 running around buying his own Lego
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CornerBricks is intended to allow you to create your own custom angles. I included a few STL files for 30, 60 & 120 degree angles, but you can do 42 degrees for your next thing if you want.
CornerBricks depends on my FancyBricks library. See FancyBricks for instructions on tweaking it's "fudge" factors to get good fit between these bricks and Lego bricks on your printer. The included stuff was working on my FlashForge version of Replicator in ABS with 70C plate and 230C extruder. You may need to file the base or something if your printer mushes the first layer a bit fat.
Skip the first steps if you've played with OpenSCAD and know how libraries behave.
- Get OpenSCAD if you don't have it already, http://www.openscad.org/
- Copy the FancyBricks.scad, CornerBricks.scad & font.dxf to some folder on your machine.
- Either use a real library location, or to KISS, just make a new document and save it in the same folder as *.scad modules. (or just look at one of the other scad files).
- Enter something like this into your OpenSCAD script (on the left)
- Press F5 (Design->Compile). You'll see an angled brick with 2x2 "wings" at a 30 degree angle with 1.0mm between the corners on top.
- To make OpenSCAD create an STL file, you have to render it first, press F6 (Design->Compile and Render)
- Design->Export the STL.
cornerbricks() is used to create an angled brick. The main inputs are:
- length, which is the length of each wing (so length 2 at 0 degrees would be about a 4 long plate). default is 2.
- depth, which is how wide the brick is, default 2.
- angle, which is the angle between the two plates.
There are 2 more inputs to tweak things a little:
- fudge, normally 0, which puts a space of fudge mm between the 2 corner plates.
- hollow, normally true. Set it to false to have a flat "bottom". It prints faster and is a bit stronger without tubes on the bottom side, and L3-G0 doesn't need to stick stuff on the "bottom".
See my FancyBricks thing for more control over the brick shape. The stud size, wall thickness and other factors are all adjustable in fancybricks.scad if your bricks are too loose or too tight. These files print well on my FlashForge printer with my current ABS spool, using 230C extruder and 70C plate temps. My previous PLA seemed to print differently, so you may need to tweak things.
Additionally, steep sides can make the studs droop, so you might need to tweak values, or use a file to trim them. My printer also "mushes" the brick onto the glass plate on the 1st layer, so you may need to trim something there as well.
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Corner Bricks OpenSCAD Module Lego Angled Brick Builder by kresty is licensed under the Creative Commons - Attribution - Non-Commercial license.
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