Otaibimn My guess why they went with the battery option is reduce the need for certifications and electricity needs all over. (50/60hz 110/230v compatible worldwide) while also giving the option of having it as a portable unit
Hi there, been following this project for some time and am a long-time lurker on coffee time and other forums. I had the opportunity to visit the Kopi deva workshop and tested a fully assembled final version before I placed an order with them. Met with Brandon and Sara, it was an informative long chat. The grinder i tested has been used to make more than 1000 shots according to brandon.
The decision to fully go battery was to let it stand alone as well as portability. The grinder just popped being at the edge of the counter without any messy cords running behind it. I was quite surprised as well to see the size of the grinder, it was shorter than I imagined it to be. Beautiful finish (loved the matt black).
For the speed, for espresso on 1100 rpm (the dial for the rpm had an odometer design, loved it) it was around 25 sec for an 18gram dose, the way the beans fall out from the chute was in a donut formation, but there was a clump that will fall when the grinder stops spinning (according to Brandon its the difference in pressure between the top and bottom section). Brandon then went on taking the top wooden at the top off, the decision to use a toothed gear was great and the decision to have the motor and chamber on different sections was to combat vibration, runoff, alignment, and ease of assembling.
Then he went on by showing me all the types of bearing they tested and for the life of me I can’t seem to recall the brand or model, but it was manufactured in Sweden. The shafts were thick and short (machined in the UK) and most of them had good tolerance, he picked one off the shelf, it was less than 30 microns runoff. However, he was more concerned about the burrs being as parallel as they can be, and to my eyes, the malleable copper works. I am not sure about the longevity of it tho. The rubber wipers made it feel cheap, but it’s required, plus it is not something you would see. So I guess it was fine.
The knob to loosen the grind adjustment had rubber in the end, so it would not scratch the grinder, to adjust the grinder felt good, it was just nice, You would need to grab it tightly to turn it, it felt amazing to turn, each marking on the adjustment was 10 microns. Brandon even went through the hassle to ensure all grinder’s touchpoint is at 0 by adding thickness through precut shims at the adjustment collar.
Came back home and placed an order for that grinder on Indiegogo. The design and manufacturing of the grinder I tested were amazing. From the function to adjustment, to the components used, to the fit and finish, it was beautiful. I did not find any fault with the grinder (except for how the bean exit the chute when you stop the grinder and having to tap the chute to ensure all beans are out), Having used the DF64 and Lagom P64 in the past, this grinder feels more inclined to the P64. To be frank for ⅓ of the P64 grinder, and by matching whatever the lagom does and a little bit more, it’s an amazing deal. If there is anything you would like to know, and if I can answer your question, I will.