My friend needed a measuring cup so I designed one. It's sized based on volume, but otherwise super simple.

Similar to thingiverse.com/thing:7153 but many parameters. Defaults are a 5mm to 7.8mm shaft which is what I measured on my machine. I got rid of the cut on one side as that led to slightly uneven pressure inducing a bit of wobble. In this model you can change: shaft diameters, bolt sizes, washers (if used), nut traps, and overall dimensions. This will make a strong shaft coupling without using much plastic. The code also makes a cleaner stl then my previous coupling.

United States Income distribution by household.

The #OCCUPYWALLSTREET (and other places) protests got me interested in looking up some real* income data, so I made a visualization. Each unit of height is $2000.

* Data from census.gov/hhes/www/cpstables/032011/hhinc/new06_000.htm

I used linear interpolation and the initial data only has 42 groupings, so these numbers aren't super accurate. It would be great if someone knew where some better data is. Data on net worth would also be interesting, but I'll save that for another day.

An old infill idea of mine that uses rhombic dodecahedra. It's intended to be a low density fill using walls that are 2 paths wide. Walls are vertical or at 45 degrees. The walls being angled help evenly spred forces, so this should be quite strong, although with a large cell size you may want to additionally fill the outermost cells with a finer resolution infill. The paths look like they have different spacing, but they are the same when you account for slope. The filament paths cross over each other, providing extra strength binding the layers together better. This way it knits the layers together as filament is pushed solidly onto the layer below and filament beside. If there is extra plastic, this effect is even stronger. I am also considering simultaneously moving the z axis to enforce this. This crossing over also keeps the filament from being pulled into the gaps when cornering. You could also vary how much material is being put down if there is too much plastic buildup, i.e. reducing flow when it crosses. There are not sharp turns (all greater then 90 degrees) so head velocity can be kept up.

Pictures of the test objects are just the shape of the rhombic dodecahedral infill put threw skeinforge. They don't employ this algorithm. Thats why they look so messy.

This is from January 2011, although I've been thinking about it for years... at least 2009. I should probably post stuff more often. Anyway please comment and discuss about this. I love positive and negative feedback.

A printable crab and or nut cracker. There never seem to be enough at parties with crab. (yum!)

Although I have not personally printed this, I am told the joint works great!

Edit: I have reduced the plastic required to print this, increased the gap between sliding parts, and better commented the code.

Ring with customizable text, "gem", and or cut in the back. Designed to be printed with multiple materials. Lots of parameters.
Ring is thingiverse.com/thing:11605
Font is thingiverse.com/thing:6844

Edit 2: New version now with text! thingiverse.com/thing:11629
(It's a new thing because I needed to use a different license)

A parametric ring with a triangular "gem". Ment to be printed with 2 materials.
After seeing news about makerbot's dual extrusion I decided to design something utilizing it. (even if I can't print it yet T_T )

Edit: Made this kid friendly by adding an optional safety gap so it does not need to be cut off if it gets stuck.
Edit 3: Made the gem's number of sides customizable, and gave it rotation.

I don't want to wait for glue! Drilling the Prusa Mendel's bottom plate and screwing these bushings in is much faster. Also you can take them off easily if they break or wear out.

After repeated failures of the standard z-axis rod coupling, a need for a more robust coupler was determined. This coupler has separate clamps for the 3/16th drive rod and the motor shaft, centering both without stretching the PLA too much. Additionally, it has recesses for the nuts, allowing very easy tightening and adjustments. This design however uses 4 bolts and nuts instead of 2.