The Compak K10 is a popular choice for home baristas seeking the grind quality of a large conical burr set without the price tag of a Mazzer Robur. It's a pretty good grinder overall, but it was not designed with home use in mind. I prefer to weigh out my coffee for each shot prior to grinding (aka "single dosing"), and the K10 makes that a little difficult due to grind retention in the chute.
The solution is to sweep out the chute with a small brush, and many home baristas have modified their K10's chutes to allow easier brush access. I was looking for a way to ease into 3D printing, so I decided to go a step further and design my own chute with the goal of reducing clumping and retention in addition to allowing for easier sweeping.
I had the model printed by Shapeways. Below are pictures of the new chute installed on the K10, along with the modified original chute it replaced.
For any interesed K10 owners, this part can be purchased at the following link: http://shpws.me/o8EK