Ask HN: What is the best way to learn 3D modeling for 3D printing?

I liked OpenSCAD, but I couldn’t figure out how to do anything very advanced… until the LLMs became good. Now the LLMs are great at guiding me on rather complex projects.

If I were going to do it again, I’d probably learn solidworks. They have some great discounts which make it accessible for home users.

+1 for OnShape

It works like google docs where its in the browser

I was on the same boat as you. The “Learn Fusion 360 in 30 Days” series on YouTube is awesome. In the first video you make a working Lego brick, and after a couple of hours I could make my own simple parts. Complex objects still seem hard, but simple household 3D prints turned out to be easier than expected. I started with OnShape but switched to Fusion just so I could follow this tutorial. I think (hope) the skills will be pretty transferable to any CAD.

https://www.youtube.com/watch?v=d3qGQ2utl2A

I've been getting by for years with tinkercad. It's not sophisticated but you can make some surprisingly complex and accurate parts with it very easily.

I just did this recently! Here’s what worked for me and had me modelling fairly complex parts in a few hours:

- Watch a few tutorial videos on your tool of choice (I was using OnShape) to get an understanding of what is possible - Set up a Grok project with the prompt being something along the lines of “You are mentoring me in using OnShape. Respond briefly and concisely.”

I have the two windows side by side and whenever I don’t know how to do something I ask Grok and it points me in the right direction.

You have to learn by doing. Here’s a good tutorial for Fusion 360 -> https://youtube.com/playlist?list=PLISvF10lebIzMQjtPhKVlCwzs...

And a classic for Blender from Blender Guru -> https://youtu.be/4haAdmHqGOw?si=7Sk-dxbyPFi5PL8u

I’m no expert but the little I know was trying to solve one problem after the other.

I tried FreeCAD, I really did. I gave up due to constant crashes and terrible UX and went to Fusion. Even though it's slow on my laptop it's still a far better experience. I am never going to commercialise my models so it's acceptable for me.

(Note: I would have tried Solidworks given the reasonable hobby pricing, but it's Windows only, and I don't want a web-based CAD tool)

I bit the bullet, and learned FreeCAD, and it wasn't easy. There are plenty of YouTube videos to watch a few times and try to see what's going on. The key realization for me was I could actually just draw boxes, lines, etc. Later, you can add constraints to them to get the right size, add symmetry, etc.

The reason I went with FreeCAD is because there is an available Gear Generator workbench, and I wanted to have something I could keep, without having to pray Autodesk still likes me next year.

Now, if you want to just 3d sculpt things, there are simple programs that let you push and pull shapes, rotate, rinse and repeat, like Windows Paint 3D.

I used some courses on Udemy called something like design for 3d printing with Fusion and it went through starting with very simple flat objects(I think it was a comb) and working your way up then there were intermediate and advanced courses for after. I went from zero understanding of fusion to being not an expert or even advanced but comfortable enough to design pretty much any little part or idea I have in just a few days of practice.

You can start by solving your own problem in your life. For example, design a cup holder, headphone holder, stationaries box etc. You'll need some tools like digital caliper for measuring.

Use onshape, it’s so much nicer to use something browser based than desktop based. If you’re a student it’s free.

Watch 2-3 onshape tutorial videos and then just dive in trying to make parts for yourself.

If you’re new to 3d printing you’ll soon learn that what you design doesn’t always print right. Welcome to creating things in the real world. This is part of the learning experience (and why you need to learn by doing).

Onshape also has a bunch of public cad designs, so you can look at how other people made things to learn (sort of like reading source code to learn).

Try zbrush on an iPad with the pencil

1.How to CAD Almost anything in Solidworks from MIT https://www.youtube.com/watch?v=XCfxQDCIZr0&list=PLxiALKuvAo... from the same channel, you can watch different softwares like onshape,fusion360,NX. https://www.youtube.com/@anex610/playlists 2.https://www.youtube.com/watch?v=2sSgkW0MhBw&list=PLROUP1bV8R... https://drive.google.com/file/d/1tRznYbRaJ39XZNVYdS04eQiWDwE...

For exercises:

1.Download 2d drawings of model engines, model them in CAD software and also the drawings you got from the website are manufacturable. https://outerzone.co.uk/plans.asp?cat=Engines

2. Grabcad,thingverse(for 3d printing).

3.https://www.dropbox.com/scl/fo/tfrcdejxdd06kluk2hywh/AMLOrdy...

For 3d printing:

https://www.reddit.com/r/3drprinting https://www.reddit.com/r/functionalprint/

https://www.youtube.com/watch?v=T-Z3GmM20JM&list=PLGqRUdq5UL...

And there are so many resources on the internet for 3d printing.

If you have questions, let me know in the comments.

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