So I got mine today. It is a heavy thing - about 410g. Depth is adjustable.

To see if the thing works, I used 12g in a VST15 basket and my Silvia. When I use this low dose, it seems that everything has to be just right for a spritz-less naked extraction. Coffee was a Peru, taken to the start of 2nd crack, 10 days post-roast.

My normal shot prep routine is to shake the grounds out of the Pharos into a small cup, dump the grounds into the portafilter, distribute using a cocktail whisk in a spirograph pattern, followed by one OE-style slap shot, and then tamp.

I used my normal routine to dial the Pharos in to give 22g out in 30 seconds (1:1.8 BR, 19.8% EY). I then repeated the pull substituting the OCD right out-of-the-box for the whisk and slap shot. Using the OCD at this depth resulted in very little compression during tamping - maybe a couple mm. 23g in 30 seconds (1:1.9 BR, 20.4% EY). So, pretty much the same result.

OCD comes with a couple spacers installed, so I tried again with no spacers (so more puck compression during tamping) and one spacer. The results were worse, i.e., the more puck compression that was done by the tamper, the lower the EY (and the more sour the espresso, but tasting was not blind).

So OCD seems to be doing something, at least in the above situation. I have no idea what - it could very well be simply compensating for the handle side of the portafilter .

LOL! So far I have found that setting the right depth is key. Too little depth gives a result that looks good but doesn't give a nice start to the extraction. (I am always dosing the basket unevenly so the OCD has to do something, and looking for the naked extraction to start at the same time everywhere across the basket.) I'll eventually design an experiment to see if there is a (statistical) difference in extraction yield between OCD and my WDT-like stirring.

Just letting people know that you can now buy this stateside from BrewGlobal for $110 - http://brewglobal.com/ocd-coffee-distribution-tool.html

Haven't ruled it out yet, I'm currently LOVING my new Eazytamp 5 star pro. Not sure this will really make much of a difference.

Currently I grind into my blind tumbler, WDT with cocktail wisk, then I put an OE dosing funnel on my portafilter with the blind tumbler on top of it, then I pull the tumbler plug out, tap it a few times, then I shake the portafilter with dosing funnel back and forth a few times to even out the coffee bed - this works well, but this is where the O.C.D. could maybe take over? So now I have an even fluffy WDT'd coffee bed, then I use my 58.4mm Eazytamp. Results have been pretty perfect. Anyway, it takes longer to write then it does to actually do any of this, after I finish grinding, I'm activating the pump about a minute later.

If you are happy with your workflow, then I don't see a need for you to get an OCD. OCD is for a two- or three-step workflow: grind into portafilter, OCD, and, depending on headspace needed & other factors, tamp.

As an aside, when I had my HG-one, I never used the blind tumbler. My workflow was: grind into portafilter with funnel, cocktail whisk Spirograph of grounds, one downwards thwack, tamp, funnel off. (Reverse the last two steps for an OE funnel.)

http://blog.naver.com/PostView.nhn?blog ... rom=search

found a review from korean blog. Even if you don't understand korean I think the pictures tells the whole story. The look of the puck after brewing look near perfect... This plus Push tamper would nearly eliminate any channeling due to barista's skill level.

Thanks for the link. Mine should be here on Wednesday.

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While members are certainly welcome and encouraged to discuss/share their original 3-D work, we ask members to respect others' intellectual property. I've removed the posts about creating and sharing a 3-D printing of an ONA Coffee Distributor replica.

HI Dan - It is quite fair. I just wanted to give people the opportunity to try the concept before they invested a lot of money on this tool. I do not in any way see the 3D printed as a real alternative to the steel version, who wants to use light weight plastic (<15 gram) in their everyday routine So for those who managed to download the model yesterday, buy the real version, if you like plastic version

I have removed the model from Thingiverse again.

I don't understand. That's not how copyright works. Copyright protect the product itself; not the idea of it. That's for patent. OCD is not patented anywhere(I don't even think it's patentable) therefore ONA doesn't 'own' any idea, or mechanism behind OCD. Dyrlaegen's design is definitely inspired by OCD's design, however it's his original and it does not infringe any intellectual property ONA have.

Is this tool only available for 58mm portafilter?