This portafilter is the result of my quest to reduce the number of espresso accessories on my counter. It's bottomless, fits standard Gaggia-compatible portafilter baskets, and best of all, lays down flat on the counter so it doesn't need a portafilter stand or mat to tamp!

2025-10-24 - By request, I've added an M10 version so you can CNC the portafilter head and add whatever M10x1.5 handle you'd like. It's likely to be much more expensive than the original top/bottom version but to each their own.

Parts:

The original top/bottom portafilter needs the following components: 

• Portafilter top
• Portafilter bottom (handle)
• 8 M2x14 Stainless Flat Head Machine Screws (https://www.aliexpress.com/item/2251832181264946.html)
• Basket spring clip for 58 mm portafilter (https://www.aliexpress.com/item/3256805703350564.html)

The portafilter with M10 handle needs the following components: 

• Portafilter_ThreadedM10 (head)
• M10 handle (M10x1.5x12mm max length, handle D=30 mm at max to rest flat)
• Basket spring clip for 58 mm portafilter (https://www.aliexpress.com/item/3256805703350564.html)

Materials:

• Portafilter Bottom: PC, Nylon
• Portafilter Top: 304 Stainless Steel (Bead blast finish recommended to hide cutter marks) or 6061 Anodized Aluminum
• Portafilter_ThreadedM10: 6061 Anodized Aluminum

Remixing Notes: 

The current handle is fairly simple, with a focus on functionality over appearance. I've included a STEP of just the adapter portion of the handle (Portafilter_Bot_Handle_AdapterOnly) to make it easy for anyone to design their own handle :)

The portafilter top went through a number of test revisions, and should lock in nicely at 90 degrees (I use a standard-height silicone group head gasket). I don't recommend changing it, but that's up to you. 

Does this design really need 8 screws? No, but the safety margin on 4 was too low for my comfort, and 6 didn't match the design well imo, so 8 it is. 

License:

This is open-source under a CC BY 4.0 license, so feel free to remix, modify, or even sell portafilters. All I ask is that you properly acknowledge me when doing so. For example: 

Gaggia Open Portafilter by Loogle is licensed under CC BY 4.0