On his blog my plastic future, Gregg Wygonik lays out why Bonzai 3D (B3D) is a good tool for modeling for your MakerBot, and maybe better than SketchUp Pro. Gregg says he wanted to find an alternative, in case SketchUp goes through some changes after Trimble takes it over from Google.

Sketch Up Pro and B3D run about the same in terms of price (just under $500 for both). However, he says his files from SketchUp occasionally have some problems when you try to slice them in ReplicatorG. No such problems in B3D:

Half the time I would have to rework parts I made in SketchUp that had holes or other simple design bits due to errors with slicing in RepG; no such issue with the many things I threw at it from B3D. Interestingly B3D has the ability to “diagnose” various potential problems when you export a STL file, but even with it reporting issues with a few of my objects, I had no problems with slicing/printing.

Here’s Gregg’s Pro/Con list for Bonzai 3D.

Things I liked:

• ability to draw lines and primitives as walls (think: no need to draw an extruded hexagon followed by another one a little smaller and push/pull to remove the middle, just draw an extruded hexagon with a set wall size and done!);
• some pretty sweet additions to regular booleans (slicing, object and surface splitting);
• NURBS with some really cool blending tools, in a much more approachable interface than Blender;
• 4-up “old school” view (top, left, right, perspective all at once);
• helix creation (screw tops!!);
• rounded or faceted edges with myriad settings;
• right-click on any tool and set a keyboard shortcut;
• and my new favorite: thicken, which takes any non-solid and turns it into a solid of a specified width

Things I didn’t like:

• some features require the setting of custom workplanes while some don’t and you don’t know until it throws an error dialog (workplanes are all new to me, but I like overall);
• inconsistent workplane handling (“lock workplane” sometimes doesn’t lock, and you have to use “save custom workplane”);
• adding dimensions to a part is hit-or-miss whether or not it will measure between the points you click or the entire edge you’re touching, while “measure distance” works perfect but doesn’t leave the dimensions on screen;
• too much reliance on hovering to open up tool groups and additional options (small gripe)

More here.

There was a really nice set of responses to a post last week about sketching. Basically, I asked whether blog readers and MakerBot operators were accustomed to sketching their designs from the very beginning or using CAD tools to 3D model a design from the get go.

I just thought the responses deserved a quick recap, especially because they underscore the point that there is no right answer. As someone who jumped into this company with no background in 3D printing or any other hardware hacking, I have been continually surprised how accessible the concepts are. I think it’s nice to point out that those of you who do such great work all also have varying processes — so the results aren’t just individualized, the process is too.

The star of today’s episode of MakerBot TV, Kacie Hultgren (aka PrettySmallThings), said that the sketching stage is often absent from her work; not because she eschews pencil and paper, but because much of what she does comes from photographs. It’s pre-sketched, in a way.

Emmett, whose Things number among the most notable contributions in the Thingiverse, similarly doesn’t sketch much. But in his case, it’s because his “imagination works in 3D already.” Communicating an idea to someone else, however, deserves a sketch. Renee  not only sketches, but cleans that sketch up in Illustrator before bringing it into a modeling environment.

The creator of MakerBot mascot R.Maker (pictured above), ErikJDurwoodII, said he sketches to lend some purpose to the CAD process, even if that sketch will change over time, and Gregg Wygonik also uses sketching to make sure the computer phase doesn’t include avoidable elements that cause discouragement. (Visit Gregg’s Thingiverse page here.)

Stephen Holmes, who writes for Develop3D, pinged us on twitter with a really relevant article showing yet another mindset: 3D sketching. The people at the UK product design consultancy 3form Design (3fD) do specifically leave pencil and paper sketching out of their process. Founder Austen Miller argues that the “reverse engineering” required to take a designers sketch on paper into the domain of the engineer can cause the loss of original design intentions. Instead, the groups designers start in SolidWorks.

Echoing what our commenters said:

Miller doesn’t succumb to the argument that by jumping straight into CAD stifles creativity. In his opinion, just like pen and paper, CAD is a tool and depends whose hand it’s in as to the end result. “Creativity should not be measured by the medium we choose but how successful we can be with it…”

Thanks, all, for the input!

Autodesk 123d is one of many freely-available apps that new MakerBot users might consider learning.  And unlike some other programs we love, it looks like Autodesk wants it to be easy to print your models on a MakerBot.  In fact, they want it so much that they’ve just posted the above video on their youtube channel.

It’s a bit long (over 9 minutes) but put it on your list for when you’re woodshedding your 3d-modeling chops.  While it’s specifically aimed at the Thing-O-Matic, most of what they’re saying should transfer to the Replicator.  Just model for a larger build area!

123d is a bit different from other modeling programs, and might be a bit counter-intuitive if you’re used to one of the others.  However, their youtube channel has a number of tutorials and there are some neat things about the project (like an iPad app and a photo-to-model program.)

If you’re looking to pick up some 3d modeling skills while you’re waiting for your Replicator, this is one of many great programs to learn!

Check out this great Google SketchUp tutorial for MakerBot Operators from Tested.com! No doubt many of you have caught their show. I particularly love their MakerBot Mystery Build Fridays, for obvious reasons. Well, in addition to exploring the Thingiverse and printing with their brand new Thing-O-Matic, they are also helping all of us contribute more great designs.

Here’s a teaser from their post:

Most weeks, our famed MakerBot printouts are culled from a handy website called Thingiverse. It’s here that members of the CNC community can submit pre-made models for anyone to print — and if some of our past videos are any indication, there are some very good ones available too. But while it’s easy to print someone else’s creation, there’s something to be said for designing one yourself. There’s a sense of accomplishment that you just don’t get by mashing “print” on a pre-made design. (Read more.)

There are quite a few Google Sketchup tutorials out there, but not that many good ones focused on 3D printing with a MakerBot. Thanks to Tested.com for sharing the good stuff!

Rotary Sprinklers by Supermange

If you’re using Google Sketchup for designing 3D printable models, you may have noticed that exporting to STL’s using some of the various plugins can be very hit-or-miss.  After checking out Supermange’s rotary sprinklers I was reminded of this quick fix for a very common design problem in Google Sketchup – the “flipped face.”

Looking at the screenshot above, you’ll notice that the facets of the object are either a white-and-light-gray tone or a dark-gray-and-darker-gray tone.  As a surface modeler, Google Sketchup doesn’t much pay much attention to whether a surface is on the outside or inside of a model.  However, once you turn it into an STL, this can create problems.

Fortunately, this is an easy problem to fix.  All you need to do is right click on the darker face (such as much of the top right flange of the model above) and select “Reverse face” from the menu.  While you can select multiple faces at once and flip all of them simultaneously, this still leaves a minor, and somewhat tedious, problem of detecting the flipped faces in the first place.  If they are too numerous or tiny to locate, you might be better off using some STL correction software to fix the flipped faces.