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If you make pour-over java you know that sometimes the extraction is weak due to grind, filter paper flow rate, or other indecipherable variable when using your V60.
The solutions are varied and pricey, often requiring new equipment, revised methods and repeated failures. The CDPM works with any dripper,
costs under $14 and you'll wonder why you didn't think of this yourself!
It is a bar that sits astride your dripper. A slotted hole in the center steadies a shaft with a magnet on the end. The separate plunger-plug is fitted to the drain hole with its magnet facing upward. The filter paper, grounds and hot water are added as usual. When the appropriate time has elapsed the shaft is dropped and raised to a detent to open the drain. The CDPM comes with drain limiters to extend the extraction time as the coffee flows through.
Best Dripper? Best Value?
https://youtu.be/Rp...si=xvQPt6Z0jM1Iept8
$48.50 or the CDPM @ $13.96? [minoradjustments, Apr 07 2026]
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"Hurry up and drip, or feel the wrath of the plunger!" |
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Is that the basic operating principle here? |
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Well I just learned what the word 'detent' means so, (+) |
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Much less violent. When the vertical rod with the magnet on the end grabs the plunger/plug through the bottom of the filter paper, it is raised to allow the coffee to flow down around it. The drain limiters have different sized holes to regulate the flow to your desired strength. |
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In future versions froo-froo flavoring agents are added to the dissolving drain limiter to replicate overpriced coffees from the baristas. |
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So ... in a normal coffee dripper, the fluid starts above the paper and goes from there down the drain at some rate which is a function of the porousness of the paper and maybe the size of the grounds. Right? |
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And in this new device, the fluid will still seep into the paper until the paper is saturated, presumably, but the intentional blockage of the drain prevents it from going further until you say so - so, it sits for longer with the coffee grounds. Is *that* the basic idea? |
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And the shaft has a down-stroke and an up-stroke, and the up-stroke opens the drain, whereas the prior down-stroke ... does something else? |
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That's about it. Rather than flowing through immediately,the immersion stage of is lengthened before the coffee is allowed to percolate through the mass of grounds in the bottom of the filter cone. |
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I use a Prismo device with an Aeropress that holds the coffee/water slurry in the column until your preferred immersion time has elapsed. It also prevents premature dripping from the Aeropress standard method. Pressure on the Aeropress plunger forces the retained water through the grounds in the percolation stage to complete the extraction, pushing through a reed valve in the Prismo. The problem is that extraneous variables are admitted by using an additional device. The Prismo used a steel screen and shoots the coffee into the cup below with some force. I wonder if the aeration of the coffee stream has any effect, positive or negative. The Prismo is yet another device that requires cleaning. The basic Aeropress is a great customizable device and I've added even more complexity with the Prismo. |
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I want to go back to the basic v60 pour-over method but have control over the immersion time before allowing the gravity drip to finish. Retaining the brew allows for some fiddling with agitation, application of the hot water, and other farkling. |
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The rod with the magnet is only used to raise the plug from the drain on the v60. I used a bar across the top, so that the flow could be adjusted by the height of the needle of the needle valve, much like the way a carburetor works. The magnetic contact between the rod and the plug allows the filter paper to work normally with no holes, and makes a measured release of the coffee possible. The down stroke is only used to make magnetic contact with the needle plug. The rod has nubs that fit into detents in the support bar across the top. |
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Silicon plug with hole = $2.99
Steel needle valve = $4.99
Rod w/ magnet end = $2.99
Top bar = $2.99 |
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(I also want a double-walled borosilicate v60 so it retains heat while in the immersion stage.) |
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Sorry it took me a while to work it out. I probably needed stronger coffee. |
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