Bayonet + Shower Screen for DIY Espresso Machine - Page 2

A haven dedicated to manual espresso machine aficionados.

Postby Dingus » Mar 19, 2019, 11:05 pm

Judokus wrote:Hi about going for the Bezzera bell? At least in Germany it's not too pricey.

Thank you for the suggestion!

Judokus wrote:Any idea on how to get rid off the trapped air above the coffee puck? May be the easist is to stick with the rok as the water path would be shorter?

Not sure if I understand your question, but there is a check valve between the piston chamber and the shower screen area with a ~2psi crack pressure, this wont open until the lever is pushed downward. The piston chamber fills with water using vacuum pressure from the piston moving upward. The piston stroke displaces about about 75 ml or 2.5 ounces of water.

I'm leaning towards the ROK bayonet assembly due to simplicity. What I'm hesitant about is their silicone shower screen and very small silicone portafilter seal. Can anyone who has used a ROK chime in? I'd be really interested in getting some details and basic dimensions. For example, is the shower screen held in place with the portafilter gasket?


Postby Dingus » Mar 19, 2019, 11:42 pm

Replying to my own post, it looks like the portafilter gasket for the ROK IS the shower screen. Kind of slick, but does it work well? The availability of screen/gasket replacements might be limited.



Postby Dingus » Mar 21, 2019, 9:23 am

I ordered bayonet, silicone filter/seal, and bottomless portafilter from espresso unplugged in Australia. The price was $72.15 AUD or $51.42 USD shipped. I'll post an update on this thread when the parts come in and when I implement them into my assembly. Beyond that, I think I need to transfer to a proper machine build thread. ... pare-parts