This portafilter holder for the Bodum coffee grinder was created out of necessity. I needed a way to grind my beans and not spend $300 for a costly grinder. Total cost of this solution is around $120.
Bodum Bistro Burr Coffee Grinder = $90
Rapid Prototype Portafilter Holder = $30
Total cost = US $120
The portafilter holder was created using one of my favorite open source projects: FreeCad. If you order this accessory for the grinder, remember that it will 3D printed for you and that it might take more than a couple of weeks to be printed. Shapeways is good at printing quickly, but this will take a bit longer than a mass produced product.