3D printed parts dunked in acetone vapor produce professional finish

Acetone Vapor bath

TrenchPhysics documents his experiments with taking objects created on his 3D printer and dunking into a bath of acetone vapor to produce a professional finish. 3D printers produce objects by printing them from the ground up one layer at a time. This causes every printed object to have visible ridges on it. The acetone vapor causes the outside layer of the 3D part to fuse together, eliminating the ridges and creating a uniform smooth surface. The end result makes the part very shiny.

Check out his video here.

Printable Ball Bearings, welcome to the future

It was made out of printed parts, so it would only last a month before I’d need to print new bearings and other moving parts.

From  Printcrime by Cory Doctorow.  Link here:http://craphound.com/?p=573

I am glad to bring us closer to this terrible future. Here are some printable bearings I made. I am working on a project that needs alot of them and was enraged by not being able to print them. Especially after reading this story.

Get the models here:


They are a little tricky to put together. First you have to cut out about 15 sections of printing stock into 2cm long segments. The length is flexible, as long as it fits into the bearing housing . Then place all of the pieces of stock into the outer ring for the bearing. Carefully place the inner tube into the out ring and snap it shut. Now it should roll freely. Depending on how well your printer performs you will have a shorter or longer break in period. After the pieces are properly broken in its nearly as smooth as metal ball bearings. I haven’t done a load test on them, but they spin freely when spun by hand.

Leonardo Robot Man

Here is my Leonardo Robot.

Enjoy downloading it from: http://www.thingiverse.com/thing:1769

So a few days ago a friend of mine was itching to build something. They look around and start showing me a neat paper robot from http://www.paperrobots1999.com/home.html

I was thinking it’s really cute, but I have a 3d printer so I had to make one for myself. I realized that the transition from paper to plastic is one that is hard to make.  It requires joints that work in plastic and all the joints are going to be rigid now. For instance the hips on the paper robot are done by just having loose thread, I can’t do that in plastic.

Anyway, I knew how to make hinges in plastic from my previous post of an evil robot hand here: http://www.thingiverse.com/thing:1413

I then set out to make my own robot. But how should I structure him? A little Golem to call my own to do my evil bidding. I thought I should make him perfect. But how can I make him perfect?  Suddenly I knew the place and who to ask , Leonardo Davinci’s notebooks. Leonardo sketched up the perfect proportions for a human. So I decided to follow them.

The measurements and all of the proportions can be found here: http://en.wikipedia.org/wiki/Vitruvian_Man