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<InPhase>
Mark Rober did a "compliant mechanism" Nerf gun design as part of his recent video. I took his posted file and printed it out for my kid, and after a hefty amount of fixing the zero tolerance design with a knife, it does actually shoot. https://www.youtube.com/watch?v=9c2NqlUWZfo
<othx>
InPhase linked to YouTube video "World’s Smallest Nerf Gun Shoots an Ant" => 1 IRC mentions
<InPhase>
It's a clever little mechanism in the design. Although it should probably be redone as a scad file to parameterize the tolerance so it works properly with FDM rather than just SLA.
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<MTO>
I could use some suggestions on how to model something: I'm trying to make a 3d model of a TRS-80 Model 4 computer. getting the bulk of the shape isn't too hard, and I've been using minkowski to round out all the corners, but there is one corner (seam?)that is concave, the transition from the keyboard to the screen, and a minkowski isnt working to
<MTO>
round that one out. any ideas how to do that?
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<J23k41>
MTO you use offset to make a rounded polygon then extrude and substract from the computer objects. Minkowski becomes very slow with concave fillets so use minkowski before
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<guso78k>
kintel no: i did not use setenv-macos.sh. This also explains why I had to set the PATH for qmake manually
<guso78k>
Now I explicitely tried to find the original documentation how to compile on macOS in order not to make yet another silly mistake, but i could not find.
<MTO>
and it looks about right. Now I need to start doing scaled prints and sections to see if it looks good in real life.
<InPhase>
MTO: Ah, you're back. If you're trying to do the inner curve of the monitor inset, you probably want something like constructing the negative shape to difference out, using a hull on two thinly linearly extruded squares with different offsets on the squares.
<MTO>
@InPhase Right now, I'm working on the transition from the keyboard to the screen, which I guess is a fillet. I'm not sure there is a curve on the monitor inset, not the way I think you mean, anyhow. I'll have to look at the rendered model once I get that far along.
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<InPhase>
MTO: Yeah, I figured you were starting with that curve. But there i at least such a curve on the images of the TRS-80 model 4, and it requires a slightly trickier step like that.
<InPhase>
s/there i at/there is at/
<MTO>
Do you mean how the glass bows out because it's a CRT, not a flatscreen?
<InPhase>
MTO: The part around the glass.
<InPhase>
The glass itself is fairly easy.
<InPhase>
A flattened sphere, cropped, will do the glass.
<MTO>
Ok, I see what you're looking at. I'll be using a flatscreen, so I'm not sure if I'm going to do anything to replicate/pay-homage-to that feature. Need to think about it...
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<kintel>
teepee Nice, I'll take a look at the new runners
<MTO>
The inset for the monitor is way simpler when you're meeting a flat screen that is actually square.
<kintel>
My guess is that the new runners will (eventually) become available as running old infra will be way too expensive for them :)
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<teepee>
kintel: yeah, quite possible. maybe we can just try at some point, in the end I don't like to put everything into one bucket, history has shown lots of change, just calling some names with Travis and Appveyor
<kintel>
At least we have both GitHub and CircleCI as providers still, and both give us macOS support :)
<teepee>
yep, macos and windows would be difficult on our own ci right now
<Guest36>
I have down loaded OpenSCAD and find it very useful. However when I save a design as a scad file and go back to it later it doesn't open. The design is based on a Thingiverse sweeping nameplate design.
<Guest36>
Only the original design opens
<teepee>
oh, that's strange, what's the saved design look like in a text editor?
<Guest36>
hold on....!
<Guest36>
It just has the original text in when open in Notepad++ i.e your text etc..
<Guest36>
/ preview[view:south west, tilt:side]
<Guest36>
/Number of faces to round the sweep. TIP: Use "2" if you want to have a quick preview here in the customizer. Set to at least "10" once you generate a model for printing.
<Guest36>
faces_segment = 6; //[1:40]
<Guest36>
/Set the upper text to render
<Guest36>
textstring1="Your Text";
<Guest36>
/Set the lower text to render
<Guest36>
textstring2="Next";
<Guest36>
etc etc..
<teepee>
and what happens if you open that file?
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<teepee>
as it's really just text, I don't see much reason why it would behave differently
<Guest36>
if I open in openscad it just shows the aabove - the design is not shown?
<teepee>
that's normal, you have to press F5 for preview
<teepee>
and to prepare for output F6 - called "render" in the sense that it renders the geometry
<Guest36>
mmmm...f5 or F6 doesn't seem to do anything..
<Guest36>
not on my keyboard anyway!!
<teepee>
Menu: Design -> Preview
<teepee>
then maybe: View -> View All
<teepee>
could be the design is somewhere out of camera view
<Guest36>
not there yet..still only showing 'Your text Next'
<teepee>
maybe some parameters are set so there's no output
<Guest36>
maybe....its just every time I want to make a mod to the design I have to start from scratch..
<teepee>
it seems that the file supports the so called customizer, if you use that you don't need to change the file itself
<Guest36>
not sure what you mean by that..bear with me, I have only had 30 mins experience with this programme
<Guest36>
I do have the customizer screen in the window
<teepee>
that shows a form with some settings the author proposes to be changeable
<teepee>
so you can enter values there instead of the text file
<Guest36>
I see that but would that effect opening an existing file?
<teepee>
no, those settings can be given a name and saved in a separate file along the orignal *.scad
<Guest36>
ah..you mean where it says save preset..?
<teepee>
yep
<Guest36>
and I can open saved preset in customizer window?
<teepee>
there might be a tutorial at the "makewithtech" site - it's run by a youtuber after all :)
<teepee>
there's no separate open, it will just open those too if the file exists. you'll have "design.scad" with the orignal and "design.json" with those parameters
<teepee>
aww, he did shutdown the website
<Guest36>
I will try that...thanks a lot for your help...I use AutoCAD and Fusion 360 so I think i should be able to get my head round this but you have been very helpful
<othx>
teepee linked to YouTube video "Thingiverse Broken use OpenSCAD 3d Modeling" => 1 IRC mentions
<teepee>
hmm
<Guest36>
there now..cheers....have a nice evening..
<teepee>
thanks, you too
<InPhase>
Guest36: Alternatively you can make the changes in the scad file itself, as the customizer is really doing nothing more than appending modifications to a bunch of variables (usually at the top) in the scad file.
<InPhase>
Guest36: I personally rarely use the customizer, and instead I keep an original version of the scad file, make a copy, and then I just edit the variables in that copy until I get what I want.
<InPhase>
Guest36: The customizer is simply designed to be a tool for people who are uncomfortable modifying the variable assignments in the code. And it has a few other pleasant things like sliders for some items.
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