Great creative ideas in the forum folks, much appreciated.

For conversation only - I'm wondering if anyone has thought of using a gear reducing method to turn the small rotation of that "slayer converted water knob" into a much larger one (think of 1st gear on your bike). That might make for a much easier mod using stock parts using that small range. Just thought I'd throw it out there.

Basic idea in my current form is to attach a larger gear on the knob shaft and then getting a small one to turn it. The gear ratio could be picked to best fit the profiling range needed. (would think 4 or 8-1 would be a good start) .

Have not done the slayer yet but should be happening in the next week as I get the scale incorp in the drip tray.

Hi @bcarlson65

I've read all sorts of information and was surprised that only you asked the exact same question that's been on my mind. I personally don't want to lose the hot water functionality and I can't think of any reason why we can't add another needle valve. I was going to see if I can fit it through the tamper holder location and have a horizontal lever. I'll post again once I've started testing, but would be interested to know if anyone else has tried it.

Cheers, T

I had mentioned (perhaps this thread) that I planned to make a handle to increase the ratio for the needle valve.

I have been using it for about 6 weeks and have a few last fine-tuning (aethestic) mods to do.

I should either have them done by Mon/Tues or if not, I will post the file so others can fit it.

Increases the movement by a factor of probably about 4-6 which has to be finer than the increase of a different needle valve.

But the movement is actually only about 20-25 degrees so with the stock valve and the normal knob it would be a chore to keep it tuned during the shot.

It's a 30 second install, once you have the knob off the lever fits into the 3 armed recess and you are done.

Stay Safe!

Cheers,

M./

Nice! I'd love to buy or print one an try it out. Will you be selling them or releasing the .stl?

Hey all, it may be in one of the 78 pages of this thread but I can't easily find the information so here we go!

Drinking mostly medium to light roast, did the slayer mod. Struggle to get the 9 bar pressure at the high point and the shot comes out pretty quick too (does seem to taste pretty good though but I also do have some sugar and milk in there so it does help mask a lot)

If I grind too fine, the pressure doesn't go up.

I'm not sure what adjustments to do or if the slayer mod changes how to extract.

What pressure do you see with the blind filter or cleaning disc and the water valve wide open?

10 ish bar, so it definitely can get there, I just find when I grind finer, which is what you'd have to do with the slayer mod due to the extended low flow pre-infusion, that it gets stuck and then a good 30 seconds can pass until anything comes out at the 2-3 bar pressure pre infusion, perhaps I have to increase the flow a little more than I am doing now

Jessipoo wrote:and if it's not entirely sealed, then I'm losing some water flow?

No, but you'll have a leak that never stops.

ya the spigot is not perfectly sealed with the piece I put in there and there is a little high pressure water that spurts out of there once in a while, other than water going through there, and lowering some of the water flow from the group head, it hasn't been too much of an issue though I should get a tighter fit

Did I miss the link for the file for 3-d printed arm? Looks good.