This Shapeways tutorial on "Prepping Blender Files for 3D Printing" is not only useful for 3D printers, it is a treasure-trove of 3D printing jargon.
If you have a model created from several objects or meshes, first make sure that each individual mesh is manifold (water-tight). You can tell this by going into edit mode, pressing A (once if any vertices are selected or twice otherwise) to select none, then hit ctrl-alt-shift-M (on a Mac it's ctrl-opt-shift-M).
Any vertices that get selected when you press that key combination are non-manifold vertices that have to be fixed. Often, fixing these is just a matter of creating new faces (F key) out of sets of 3 or 4 vertices. Sometimes these are stray vertices that are unattached to anything, or are attached to just one vertex by an edge. These can usually be deleted, unless they are intentional (such as those vertices uses to affect the shape while using a subsurf modifier), in which case you want to wait until after you've applied your modifier to delete them. Another possibility are vertices that are part of more than one overlapping faces...
Open the copy of the file, and select each object, one at a time. In object mode, apply all modifiers, then switch to Edit mode, hit A once or twice to select all vertices, then press ctrl-T to triangulate all faces. I don't know why, but Blender does a much better job with Boolean operations if the meshes are triangulated.
Prepping Blender Files for 3D Printing
(via Beyond the Beyond)
A good way to understand how something works is to watch how it fails. Forgotten Weapons: Over many years of filming with my high speed camera, I have a decent little library of malfunctions in a wide variety of guns. These don’t normally make it into videos, and I figured it would be neat to […]
Eccentric eyewear maker Scott Urban first kickstarted his "Reflectacles" frames in 2016; the frames used emedded retroreflectors to make them throw back tons of light, making them highly visible (and great for things like night cycling); subsequent iterations beefed up the IR reflectivity, which blinded many CCTV surveillance cameras (they use IR to paint low-light […]
The fourth incarnation of the wonderful Raspberry Pi is upon us. A faster quard-core CPU, up to 4GB of RAM, gigabit ethernet and dual HDMI outputs are the upgrades; there’s USB-C too, but just for power. The CPU boost is a big deal, say early users, but dual-4k displays and 4x the RAM bring it […]
When it comes to large computer systems, not one of them is fully secure. Even with constant updates to the platforms that keep vital networks humming, there’s always a back door. And companies are willing to pay handsomely to effective bouncers that can keep an eye on them. Call them ethical hackers or white hat […]
So you’ve visited the Kennedy Space Center every year. You’ve watched “The Right Stuff” for the 95th time. There must be something to do while you’re waiting to join Space Force for the next manned mission to Mars or the moon. Here’s a combo that should raise a salute from any fan of space or […]
Looking for a new tablet? If you haven’t upgraded in a while, it might be time to check out the latest iPad Pro for two very good reasons. First, the 2018 model is a real workhorse. The 12X Bionic chip processor means it can handle any task you set out for it, and still have […]