This Mk7 replacement features a spring-tensioned, quick-release 623 bearing idler, and shouldn't interfere with dualstrusion. The back is also open to make it easy to clean the teeth of the drive gear.

I don't have an actual Mk7, but it seems like it will work from my test assembly with parts I had lying around, including a Mk5 gear with the wrong size hole for the stepper and 3mm filament.

Clearance on the head of the idler screw might be a problem. If so, the screw may have to be replaced with some other type of 3mm shaft. A piece of 3mm filament should work.

I modified the tardis and now it hangs from my tree!
It was a hit at the ornament exchange I went to!

Make your ornament with a special message on the bottom.

I copied the Flex Box, but didn't want to use glue.

This is an iris mechanism built into a business card sized card. For simplicity and to help keep the thickness low it only has 3 leafs. This particular design does not scale well to more leafs unless it is made much larger. The initial design did have 4 leafs and is built in a way that would allow it to scale to a different number of leafs more easily. If anyone is interested I could upload that as well.

I used 4volt's dxf to create a space invaders fridge magnet.

For Mothers day I made my mom a set of earings that double as a working planetary gear.

...sorry for the pun in the name.

While talking to Zach I got inspired to model lego bricks in order to create custom bricks - the ones you always wanted but thought you never could get. Well now you can!

Of course it does not snap in place as nicely as original lego bricks but it should be good enough to create the custom lego piece you always wanted.

This is a spinoff from my boxotron software. It creates a dxf for a paper box.

I was just going to alter the boxotron script but ended up rewriting the majority of it.

The box design was shamelessly stolen from 4Volt ( thingiverse.com/thing:254 ) Thanks 4Volt !

It is only good for thin card ( for now ) as the insets and offsets for thicker material are not calculated.

Much like the boxotron this is a command line program , run ./cardbox.py -h for more information

Here's a board I designed back in 2006. At the time, I was obsessed with making easy to use controller modules in the smallest packages possible. This control board should fit into a DIP44 socket.

Includes a nice LDO 5V regulator I found, and an onboard RS232 line converter. The line voltage RS232 pins and the power and ground pins are on a screw terminal header, and just about everything is brought out to the pins on the bottom. I tried to get as much IO as possible, but obviously there are some pins that didn't make it. Includes ISP header, and also has the watch crystal for RTC.

It's a pretty neat board, and it can be assembled by hand for about $20.