teepee changed the topic of #openscad to: OpenSCAD - The Programmers Solid 3D CAD Modeller | This channel is logged! | Website: http://www.openscad.org/ | FAQ: https://goo.gl/pcT7y3 | Request features / report bugs: https://goo.gl/lj0JRI | Tutorial: https://bit.ly/37P6z0B | Books: https://bit.ly/3xlLcQq | FOSDEM 2020: https://bit.ly/35xZGy6 | Logs: https://bit.ly/32MfbH5
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<gbruno> [github] ochafik synchronize pull request #4648 (Speed up script evaluation by prehashing & interning identifier strings) https://github.com/openscad/openscad/pull/4648
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<charely6> Hi, does anyone know how to get location values from an imported STL?
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<peeps[zen]> charely6: not possible at the moment, though there are a few PRs in progress that might eventually add such features
<peeps[zen]> rendering will show bounds at least, but that I think might only be in development snapshots
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<gbruno> [github] pca006132 opened pull request #4834 (#3781 Proof of Concept) https://github.com/openscad/openscad/pull/4834
<gbruno> [github] pca006132 edited pull request #4834 (#3781 Proof of Concept) https://github.com/openscad/openscad/pull/4834
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<gbruno> [github] jordanbrown0 closed issue #3722 (Give colour triplets/quadruplets the same privileges given to x-y-z triplets) https://github.com/openscad/openscad/issues/3722
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<gbruno> [github] UBaer21 opened issue #4835 (Add Backup files to recent file list for easy crash recovery) https://github.com/openscad/openscad/issues/4835
<gbruno> [github] jordanbrown0 closed issue #4317 (Feature Request: Stl File Name) https://github.com/openscad/openscad/issues/4317
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<gbruno> [github] jordanbrown0 closed issue #4448 (Suggestion: Navigation with arrow keys) https://github.com/openscad/openscad/issues/4448
<gbruno> [github] UBaer21 edited issue #4835 (Feature Request: Add Backup files to recent file list for easy crash recovery) https://github.com/openscad/openscad/issues/4835
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<teepee> right, lets see if that floating holes trick works in an actual production print :)
<InPhase> Floating holes?
<teepee> like you have the bottom of a case with a hole for the screw and some larger cutout for the head of the screw
<teepee> so the smaller through hole is floating over the slightly bigger hole of the head
<gbruno> [github] jordanbrown0 closed issue #2435 (text() rendering at small text sizes) https://github.com/openscad/openscad/issues/2435
<teepee> interestingly cura totally messes that up with bridge support enabled
<InPhase> teepee: "Counterbored hole" is the term.
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<InPhase> teepee: I'm sometimes prone to calling them countersunk holes, just because it comes to mind faster, but that's formally incorrect, as countersunk holes are the angled ones for wood screws. The ones with flat bottoms are counterbored.
<teepee> yep, i have heard countersunk
<InPhase> And they tend to work fine upside down, because they are pretty small bridges.
<teepee> not what I've seen, as it tries to print the smaller circle completely without support
<InPhase> What slicer are you using?
<InPhase> That would be a stupid thing for a slicer to do. :)
<teepee> cura still, likely soon changing to prusaslicer once the mk4 is finally shipped :)
<InPhase> Hmm. I use cura too, and never noticed it doing such a thing.
<InPhase> I have printed quite a lot of such holes.
<teepee> let me produce a test case...
<InPhase> Naturally I can't spot a model with one in that orientation while I'm trying to find one.
<InPhase> https://bpa.st/ORTQ Test case. Firing up cura now.
<InPhase> Hmm. Although I can't read the order of operations from these colored lines in preview.
<InPhase> Oh, the horizontal progress slider will show the layer ordering.
<InPhase> Okay, it stupidly drops the ring in the middle...
<InPhase> Now to see if the old versions of Cura still launch.
<InPhase> Hmm. Cura 3.10 back in 2017 does the same goofy thing.
<teepee> it's not much better with "enable bridge support"
<teepee> it seems to be confused producing some wiredly angled lines
<InPhase> Maybe I've just ignored the errors of that layer and scraped it out in the past. It should certainly get the next layer right.
<InPhase> And it's a recessed hole so an ugly layer doesn't matter.
<InPhase> Most of that will be covered by a screw head.
<teepee> yeah, with M3 it's sort-of ok-ish just ignoring the mess, maybe some minor cleaning out the screwhole itself
<InPhase> That is a strange oversight of Cura's algorithm. I guess I built up too much faith in its handling of bridging.
<InPhase> It's pretty obvious to bridge with straight lines first and then fill it in.
<InPhase> Like, build up a cross web.
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<peeps[zen]> that's what bridge support is supposed to do
<teepee> yep, I've never seen it working well though
<teepee> which is why I always bump my head on the table when people insist on G2/G3 support for arcs being very important
<teepee> I think those things would be much more useful to have
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<J23k84> teepee using just a shallow (5°) taper often works fine to reduce a hole
<teepee> that 2 layer squares work extremely well with current slicer behavior
<teepee> aha, looks like we have bed adhesion this time, 3rd run is hopefully a go now
<teepee> thumbs up to a good iso propanol clean :)
<teepee> case for https://imgur.com/a/IDHGqeY coming up (hopefully)
<gbruno> [github] jordanbrown0 edited issue #1341 (linear_extrude does not generate symmetric geometry) https://github.com/openscad/openscad/issues/1341
<teepee> J23k84: sounds cool. that's the stuff which should make printing so much more simple
<J23k84> is that a usb power distribution
<J23k84> .. there is some diagonal slicing that imho even better .. however i think building support towers and bridge would also work fine
<teepee> yeah, it's supposed to replace that insanely stupid 3.5V power stuff used for christmas decoration which is based on some children toy connectors
<J23k84> you could replace all lambs with led and drive with 5V USB directly
<J23k84> lamps
<teepee> they already bought replacement leds, not sure how those work, if they are 2 leds + resistor or something
<teepee> as that normal connector is not keyed for +/-
<teepee> hmm, it could be AC though
<J23k84> just put 2 smd LEDs in .. one will work  - Ü
<teepee> ah, the transformer lists 4.2V DC
<teepee> I'm using 2mm JST PH which are keyed, so I just have to solder the right way, that should be fine
<InPhase> J23k84: That arc overhang video is on point to what needs to be done.
<InPhase> That'd take some carefully tuned printing temperatures and cooling, and some stiff filament to go as far out as they demonstrate, but it's at least the right direction to go with the problem.
<teepee> yeah, if half of that works in the general case, that would be awesome
<InPhase> I've seen cura actually do that sometimes, but only if you feed it just the right shape and it gets lucky on its trace I guess.
<InPhase> Like, I've had some circular overhangs, and it did exactly that.
<InPhase> hemi-circular
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<InPhase> s/hemi-circular/semicircular/
<J23k84> I have some carbon greentec  pro filament that is so stiff it prints horizontal .. quite funny
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<gbruno> [github] jordanbrown0 closed issue #3447 (Feature suggestion: Fillet and chamfer) https://github.com/openscad/openscad/issues/3447
<gbruno> [github] jordanbrown0 closed issue #1504 (Add way to compute model volume) https://github.com/openscad/openscad/issues/1504
<teepee> oh, Giles is still around :)
<gbruno> [github] jordanbrown0 closed issue #166 (scale by zero should give warning when preview rendering) https://github.com/openscad/openscad/issues/166
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<gbruno> [github] kintel edited issue #4825 (Move manifold out of experimental) https://github.com/openscad/openscad/issues/4825
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<Salamanders> Pretty basic openscad question: When I try to linear-extrude a spiral "wire" the wire is very flat.  Is there an easy way to extrude this in a way where it looks more like a constant-diameter wire round around a dowel?
<Salamanders> linear_extrude(height = 40, center = false, convexity = 10, twist = 500)
<Salamanders> translate([30, 0, 0])
<Salamanders> circle(d = 20);
<othx> peeps[zen] linked to "Parametric Helical Coil (Spring) by thehans" on thingiverse => 3 IRC mentions
<Salamanders> Very nice!  (and harder to solve than I thought - I was imagining rotating the circle or something)
<teepee> meh, tree support did not work
<teepee> Salamanders: the BOSL2 library has some extended stuff in that regard too
<Salamanders> oh score.  That lib looks amazing.
<J23k84> Using a polyhedra is easier like with  closepoints or   include<ub.scad> Coil();
<teepee> yes, I tend to use more specialized smaller libraries. most of my designs are relatively simple, like cases for electronics stuff
<J23k84> future me would suggest  rotate_extrude(pitch=10) translate([10,0])circle(5);
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<gbruno> [github] jordanbrown0 closed issue #4317 (Feature Request: Stl File Name) https://github.com/openscad/openscad/issues/4317
<InPhase> J23k84: In past discussions it has been pointed out there are some nuanced problems to sort out there with self-intersections on that rotate_extrude, which is where previous thoughts about it stalled out.
<InPhase> J23k84: It's not an unsolvable set of problems. Just trickier than the other extrudes.
<InPhase> J23k84: This is probably the singular reason we don't have it yet. It has sure come up as wanted often enough.
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<J23k84> InPhase hope you feel better ..  I would assume the intersection couldn't be more of an issue than with rotate extrude .. i had similar  with my Coil module and pitch just need to be bigger the y size of the profile shape if over 360°
<InPhase> J23k84: Oh, yeah, that sinus pain was just a one day thing.
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<gbruno> [github] kintel edited issue #4825 (Move manifold out of experimental) https://github.com/openscad/openscad/issues/4825
<peeps[zen]> I just had a thought about possible self intersections for rotate_extrude with pitch. if angle >=360, then it split it into multiple operations with <= N-1 sections, N being number to complete a full rotation, close off the ends, and just union each of those
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<peeps[zen]> possibly with one section overlap across parts, in case coincident faces are an issue
<gbruno> [github] kintel edited issue #4825 (Move manifold out of experimental) https://github.com/openscad/openscad/issues/4825
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<gbruno> [github] kintel edited issue #4825 (Move manifold out of experimental) https://github.com/openscad/openscad/issues/4825
<gbruno> [github] kintel edited issue #4825 (Move manifold out of experimental) https://github.com/openscad/openscad/issues/4825
<peeps[zen]> J23k84: i think restricting the pitch would limit its usefulness too much, I would assume many would want to use it for threads which would require some overlap