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Jern @jernd.bsky.social · 15/09/2026

Yeah, I understand -- maybe this demo will illustrate a bit better. The middle and right hand shapes are identical, just with different viewer settings.

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Jern @jernd.bsky.social · 15/09/2026

You are correct: it accepts points but it generates the same result as what OpenSCAD hull does. The result is a solid but potentially a tessellated one, which is valid in BREP CAD.

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Jern @jernd.bsky.social · 14/09/2026

Have you tried the new ConvexPolyhedron in build123d? It is identical to OpenSCAD hull

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Jern @jernd.bsky.social · 09/07/2026

Wow, these are so awesome!

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Jern @jernd.bsky.social · 09/07/2026

Have you tried build123d yet? You can even do TTT challenges with it 👍

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Jern @jernd.bsky.social · 09/07/2026

awesome, glad build123d is proving useful!

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Reposted by Jern

MiniForAll @miniforall.com · 24/05/2026

Made parametric code that generates wind turbine terrain for wargaming. www.patreon.com/posts/wind-t... #cadquery #wargaming #terrain #3dprinting #pythondevelopment

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Jern @jernd.bsky.social · 12/05/2026

Agree, and it is one big reason why I stopped using it

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Jern @jernd.bsky.social · 29/04/2026

Here's my system prompt for use of build123d with LLMs. Greatly improves production of idiomatic build123d code! gist.github.com/jdegenstein/...

gist.github.com

build123d-system-prompt

build123d-system-prompt. GitHub Gist: instantly share code, notes, and snippets.

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Jern @jernd.bsky.social · 21/03/2026

Wow, that was awesome!

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Jern @jernd.bsky.social · 26/02/2026

oh and BTW my PR was merged so the above link has file export too now (BREP only, more formats soon)!

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Jern @jernd.bsky.social · 26/02/2026

Surface modeled this mouse in build123d while roughly following the Shawn Hymel Digikey FreeCAD tutorial youtu.be/HDGdeLWGBns #FreeCADCurves

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Jern @jernd.bsky.social · 19/02/2026

I know, I am getting addicted to sharing these. The performance in the browser is also surprisingly very similar to native desktop. The next big enhancement is file export from the browser, which is already working in a PR I have opened.

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Jern @jernd.bsky.social · 19/02/2026

a recursive pattern in build123d, interactive sandbox with code here: jojain.github.io/build123d-sa...

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Jern @jernd.bsky.social · 18/02/2026

#OSHW logo in build123d, interactive online sandbox with code here: jojain.github.io/build123d-sa...

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Jern @jernd.bsky.social · 30/01/2026

What I really want to try is the `ty` plugin which acts as LSP, hopefully faster than the standard one

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Jern @jernd.bsky.social · 15/01/2026

For OpenSCAD, sadly I do not as I stopped using it quite a few years ago. For build123d I recommend the docs build123d.readthedocs.io/en/latest/.

build123d.readthedocs.io

About — build123d 0.10.1.dev166+g86ab032cb documentation

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Jern @jernd.bsky.social · 14/01/2026

OpenSCAD is worth a shot for sure, but definitely use the nightly builds -- they are more stable and feature rich. Also check out build123d, it is kind of like OpenSCAD but you get native fillets / chamfers.

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Jern @jernd.bsky.social · 04/01/2026

Very nice work, really enjoy this series you have posted!

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Jern @jernd.bsky.social · 28/12/2025

Stuffed animals can't sign though... but seriously stay safe

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Jern @jernd.bsky.social · 20/12/2025

Introducing build123d-portable: The easiest way to get started using build123d (VS Code + 3D Viewer included, Zero-Install). Testers needed! Downloads available for Linux, Windows, MacOS (not well tested). github.com/jdegenstein/...

github.com

Releases · jdegenstein/build123d-portable

A cross-platform portable build123d installation with VSCode and OCP CAD Viewer - jdegenstein/build123d-portable

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Jern @jernd.bsky.social · 10/12/2025

Perhaps store bought is terrible, but homemade it is honestly my overall favorite pasta sauce

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Jern @jernd.bsky.social · 06/11/2025

I typically just apply the sauce immediately before putting in oven, works great for me!

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Jern @jernd.bsky.social · 05/11/2025

Walmart dishwasher powder costs 6.6 cents/ounce, Great Value pods cost 26.9 cents/ounce, Cascade Platinum pods cost 73.8 cents/ounce. The price difference is enormous! (used pricing from walmart website)

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Jern @jernd.bsky.social · 05/11/2025

It's very similar IMHO to Keurig, pre-dosed bad coffee with a high cost in the name of "convenience". Drip coffee with a paper filter that can be composted is plenty convenient for me -- while being cheaper and higher quality.

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Jern @jernd.bsky.social · 05/11/2025

Nellie's dishwasher powder is the right intersection of cheap enough, good performance, short ingredient list, and reputable source for me.

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Jern @jernd.bsky.social · 30/10/2025

Took a stab in build123d, definitely non-trivial!

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Jern @jernd.bsky.social · 27/10/2025

Yep, you can use e.g. the `location_at` operator (shortcut ^) on edges or faces and it will give you info about both location and orientation. It works a bit differently from BOSL2 but the same info is available. Here is a super simple demo, but the same idea scales to any shape of arbitrary form.

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Jern @jernd.bsky.social · 27/10/2025

Yes do it!! (Or at least give it a try to see if you like it) FYI there is also webasm build123d now too!! e. g. jojain.github.io/build123d-sa...

jojain.github.io

Build123d Sandbox

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Jern @jernd.bsky.social · 26/10/2025

They are both great communities and focused on learning and developing new skills! They both have discord channels which is where a lot of the activity takes place.

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Jern @jernd.bsky.social · 21/10/2025

How many of these shirts do you own? Honestly I wouldn't be surprised if you had one stashed everywhere given the frequency of these outages...

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Jern @jernd.bsky.social · 15/10/2025

Have you considered build123d? In short it combines benefits of OpenSCAD with benefits of BREP CAD like Fusion.

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Reposted by Jern

OSH Park @oshpark.bsky.social · 06/10/2025

Live now! Open Source Hardware Association (OSHWA) is doing a Show and Tell 12 hour Membership Drive with creators from all over joining us to show off their work! @oshwassociation.bsky.social www.youtube.com/watch?v=Yn0e...

youtube.com

Show and Tell 12 hour Membership Drive

YouTube video by The Open Source Hardware Association

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Reposted by Jern

OSHWA @oshwassociation.bsky.social · 22/09/2025

It's almost October which means it's almost Open Hardware Month! Mark your calendars and get excited because there's going to be really amazing speakers and perhaps even some sloths during our 12hr membership livestream! How are you celebrating Open Hardware Month? www.youtube.com/watch?v=Yn0e...

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Jern @jernd.bsky.social · 02/10/2025

See the [build123d cheatsheet](build123d.readthedocs.io/en/latest/ch...) for further information about available arc types (supports hovering to see doc string). 3/3

build123d.readthedocs.io

Cheat Sheet — build123d 0.1.dev194+g0166408f6 documentation

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Jern @jernd.bsky.social · 02/10/2025

Assumption 1 is described above. Assumption 2 is that the arc starts at an angle perpendicular to an axis passing through the regular polygon center. For that build123d's `TangentArc` was a good choice, however it may also be possible to use `RadiusArc` which accepts two points and a radius. 2/3

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Jern @jernd.bsky.social · 02/10/2025

No, I simply set the point at which the arc would terminate. The resulting radii are different for each regular polygon. There are a number of approaches here that would work. The correct way to formalize this is a technical drawing, but given the lack of that I had to make some assumptions. 1/2

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Jern @jernd.bsky.social · 01/10/2025

Nice, yes OpenSCAD also supports 2D offsets -- so that is probably a good idea here.

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Jern @jernd.bsky.social · 01/10/2025

Awesome, glad to hear I understood your goal better this time! This is python, yes. build123d supports exporting to a wide range of 3D formats; STL, 3MF, GLTF, STEP, and BREP.

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Jern @jernd.bsky.social · 01/10/2025

OK, I generalized it and it now works for even and odd regular polygons. FYI, It is also totally possible to use various transformations to turn these 1D objects into 3D solids (not demonstrated here). Quick and dirty video demo + code:

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Jern @jernd.bsky.social · 01/10/2025

Here's my first attempt at the square, I think should be generalizable to all regular polygons fairly easily but need to think on it a bit. 1D are first class citizens in build123d, which makes this quite a bit easier

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Jern @jernd.bsky.social · 30/09/2025

Hmm, is there a rule defining the orientation/angle of the arc at the e.g. square corner?

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