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FreeCAD: Open-source 3D parametric modeler

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21–30 of 73 posts

Re: FreeCAD: Open-source 3D parametric modeler

#21
I have spent weeks using freecad to build various things. Then I tried fusion 360, (closed-source, free but nerfed for non-commercial use).

The usability differences are insane. What took me hours in freecad takes minutes in fusion 360. Fusion 360 just does what you expect, while freecad throws nonsensical errors and randomly breaks your whole model if you edit something you've already done and it takes hours to fix.

Re: FreeCAD: Open-source 3D parametric modeler

#22
I'm now using FreeCAD for all of my mechanical design work. It's about 10% as productive for me as SolidWorks (although I'm still climbing the learning curve), which I regard as a massive achievement for open-source software.

It's definitely got rough spots, especially the tendency for models to sometimes become corrupt and flip inside out. But overall I like it, and I can make do with the problems.

Re: FreeCAD: Open-source 3D parametric modeler

#23
I have very little experience with FreeCAD, but I used Solid Works years ago. I still can't understand why with FreeCAD the chamfering or "smoothing" the edges breaks the model. I thought chamfering should be easy task if it uses SDF's or something like it for solid modelling, but somehow it makes unwanted holes.

Re: FreeCAD: Open-source 3D parametric modeler

#24
Past related threads:

FreeCAD 0.19 - https://news.ycombinator.com/item?id=26533384 - March 2021 (60 comments)

FreeCAD Simulator - https://news.ycombinator.com/item?id=25098981 - Nov 2020 (13 comments)

FreeCAD BIM development news - https://news.ycombinator.com/item?id=24951311 - Oct 2020 (23 comments)

FreeCAD: A free and open source multiplatform 3D parametric modeler - https://news.ycombinator.com/item?id=24513340 - Sept 2020 (268 comments)

FreeCAD on Raspberry Pi 4 - https://news.ycombinator.com/item?id=22347385 - Feb 2020 (36 comments)

FreeCAD BIM development news December 2018 - https://news.ycombinator.com/item?id=18800484 - Jan 2019 (22 comments)

FreeCAD 0.17 “Roland” released - https://news.ycombinator.com/item?id=16790814 - April 2018 (58 comments)

FreeCAD Arch development news - https://news.ycombinator.com/item?id=14480294 - June 2017 (44 comments)

FreeCAD 0.16 release notes - https://news.ycombinator.com/item?id=11533435 - April 2016 (75 comments)

Free CAD-CAM Software Demos - https://news.ycombinator.com/item?id=9893631 - July 2015 (1 comment)

Re: FreeCAD: Open-source 3D parametric modeler

#25
post #3

I have pretty mixed feelings about FreeCAD, having used it for 100+ hours across a few different projects. It’s wonderful to have a open-source alternative to the expensive CAD software that muscled its way into a near monopoly in academia/industry, but it suffers from some really inexcusable design problems, on a fundamental level. As it is, I don’t think it’s really usable as a serious tool for creating complex ass…

> some really inexcusable design problems, on a fundamental level Can you be more specific? I understand that the Topological Naming Problem is big (discussed in https://www.youtube.com/watch?v=QSsVFu929jo ), but as I understand it this is being fixed in the RealThunder branch ( https://bit.ly/3iBzQly ), and fixes may be flowing from this into FreeCAD 0.2.

A fundamental problem is that OpenCASCADE, despite being the most advanced open source CAD kernel, does kinda suck. It's single-threaded (FreeCAD has it on the main thread so any long operation blocks the entire UI) and it's… rather buggy.

Recent fun example I've encountered: doing a fillet in two places at the same time can result in either an unhelpful "resulting shape is invalid" or a crash inside OpenCASCADE, depending on the selection order (!) — https://github.com/realthunder/FreeCAD/issues/202

Re: FreeCAD: Open-source 3D parametric modeler

#26
post #8

I can't wait to see FreeCAD or something like it mature into something on the level of Blender. The problem seems to be that other free-ish CAD software exists out there, so there's not much demand. Another problem seems to be that overlap between people interested in solid modeling and people able to program for solid modeling is very small. For sculpting, Blender actually does pretty well. And for parametric solid…

> For programmatic non-parametric modeling, there's OpenSCAD. There is also CadQuery, which claims to have fundamental technical advantages over OpenSCAD: https://github.com/CadQuery/cadquery I've tried CadQuery and had a rough time of it. I haven't used OpenSCAD at all though, so I can't compare.

OpenSCAD is very lisp like. It's basically just a series of functions that operate on primitives. I tried it out and didn't like it very much. Mostly because debugging your model this way isn't super efficient.

CadQuery should be better, but they refuse to just release a standalone pip library, instead everything is distributed through anaconda which just breaks my existing library setup. Technically you can use miniconda I guess, but in reality if I'm going through that much trouble to set up software, it's probably just best to move on.

I found FreeCad easier to install and use frankly -- especially the RealThunder AppImage version.

https://github.com/realthunder/FreeCAD_assembly3/releases

Re: FreeCAD: Open-source 3D parametric modeler

#28
post #5

I have pretty mixed feelings about FreeCAD, having used it for 100+ hours across a few different projects. It’s wonderful to have a open-source alternative to the expensive CAD software that muscled its way into a near monopoly in academia/industry, but it suffers from some really inexcusable design problems, on a fundamental level. As it is, I don’t think it’s really usable as a serious tool for creating complex ass…

Curious if you have compared to SolveSpace?

Last time I used SolveSpace, what I hated the most was how the undo button was near useless.. and https://github.com/solvespace/solvespace/issues/91 is still open :/

Re: FreeCAD: Open-source 3D parametric modeler

#30
post #9

For simple stuff I think it's pretty good. Though it falls apart when you have topological changes in the tree. For more complex stuff I'm tempted to go buy Alibre Cad. It's $150 for personal use / no subscription. https://www.alibre.com/atom3d/

Alibre looks quite nice, and it certainly refreshing to see a non-cloud non-subscription base software!
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