Monster Mill MM3 Grain Mill Complete Packages

Monster Mill MM3 Grain Mill Complete Packages

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Includes Extension?: 

A complete kit that includes the Monster MM3 mill and hopper, with or without the extension. Monster mills are known for being great quality, top of the line, homebrewing mills. With all the great features of the already popular MM-2, and the addition of a third roller, you'll be able to achieve the best crush around, at a higher throughput speed. The MM-3 crushes all your grain twice, with one pass through the mill. It starts with a preliminary crush through the initial fixed gap between the top two rollers, and then ends with a pass through the second gap between the drive roller, and the bottom third roller. The initial pass slightly flattens the grain, and gets it ready for the next crush, that breaks apart the grains and loosens the starch with minimal husk damage.

The MM-3 consists of a 6061 aluminum block frame with three 6" long steel rollers riding on SAE 841 oil impregnated bronze bushings. We use a superior grade of steel that is much harder than what is found on most comparable products and should last almost twice as long. The drive shaft, and all the axles are integral to the roller rather than screwed into the ends. This makes it fine to drive the mill clockwise, or counter-clockwise. All the axles are 3/8", with minimal freeplay in the bushings.

One knurled steel roller is driven by a standard electric drill (not included) to feed the grain through the initial fixed gap of approximately .060", and then through the adjustable secondary gap and crush the grist. Both ends of the non-driven top idler roller ride in bronze bushings that are pressed into the frames, while the second idler roller rides in bushings that are offset mounted in an adjustable knob. The knob is held in a fixed position by a set-screw that you can loosen to adjust the mill. This system provides an adjustment range of .065". The knobs are made from 303 stainless steel for excellent durability, and are larger in diameter than the competition, as well as knurled for a positive grip. They've also added a groove in our newest design knobs with a matching rounded head on the thumbscrew that allows for a much better grip on the knob to avoid gap changes while milling, and also providing knob retention.

These Packages come complete with a Base, 3 Roller Monster Mill Body, and a Hopper.  Choose whether to include the Hopper Extension, which upgrades Hopper capacity to a huge 39 lb! 


  • Three six-inch steel rollers form two gaps, a preliminary fixed gap of approx .060", and a fully adjustable secondary gap.
  • Dual eccentric adjusters: 0 to .065" secondary gap - built from STAINLESS STEEL for no galling
  • 8 lbs / minute throughput
  • 3 x 6" hardened steel rollers
  • Rollers last for 12,000 - 15,000 lbs of grain
  • Drill-drive - CW, OR CCW
  • Alloy frame
  • SAE 841 oil impregnated bronze bushings
  • 1.5" diameter steel rollers
  • 3/8" integral drive shaft w/3 flats for drill driving, 2" long outside frame
  • 1144 alloy steel rollers
Community Q&A

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Browse 7 questions Browse 7 questions and 76 answers
Why did you choose this?
MoreFlavor Store
Make my brews more consistent
Jason Gonzales on May 29, 2020
Just because
brian w on May 6, 2020
Make my brews more consistent
Jason Gonzales on May 29, 2020
Looking to start going bulk with the flagship homebrews
Scott Christensen on May 11, 2020
Just because
brian w on May 6, 2020
3 rollers is superior, and I need to crush my own grain during the pandemic
Paul E on Apr 21, 2020
Made in USA
Dustin M on Apr 11, 2020
Need to crush hulls on BuckWheat want to grow it. And now will make some beer too! Kinda exciting
Thomas C on Apr 10, 2020
Looking for better quality crush
Michael Ferguson on Mar 27, 2020
High quality mill, good reviews from others i know who own one
Tim C on Mar 10, 2020
Better crush and done in one pass. Have seen this one in action and very impressed.
Donald J P on Jan 29, 2020
Replacing an old 2 roller Barley Crusher!
RYAN H on Jan 16, 2020
Need a new mill
Alex M. on Jan 10, 2020
Advertised durability
Jan V on Jan 3, 2020
The posted reviews gave this high ratings and more importantly I was ready to move up from my Phil's Mill I purchased in the late 90's
Jim C on Nov 16, 2019
I brew a lot and wore out my grain crusher. Time to step into something that will last. Toss me some stickers for my brew gear room.
Bryon V on Nov 16, 2019
why not
Rory O on Oct 12, 2019
Recommendation from a friend
MJ C on Sep 21, 2019
Because my brewmaster told me to
Ryan R on Aug 31, 2019
Good reviews
Joseph H on Aug 28, 2019
3 bbl brewery - need higher end mill. DIY capable to motorize it ourselves.
The price combined with the hopper extension. I'm not using this for beer production. Plan to grind grains for mushroom growth.
Jeremey W on Jul 13, 2019
Adjustable rollers
Yvan B on Jul 9, 2019
need better one
John White on Jul 6, 2019
Base on your site’s recommendations and the 3 roller feature
I read a lot of great reviews.
Darren F on Jun 20, 2019
Reviews on homebrewtalk.com were great.
Charles on Jun 8, 2019
appears high quality, great reviews
Ben L on May 24, 2019
I want to get into all grain brewing soon, and I generall like to buy good quality, long lasting equipment even if it's a little more expensive. Read a lot of reviews, all said that this is the best home brewer's grain mill on the market.
Eric M on May 17, 2019
I was told that this mill is the best on the market, so I will need to find out for myself
Damian D on May 9, 2019
I heard this is the best out there, will leave an honest review after use.
steven hueston on Apr 25, 2019
American made. Good reviews.
George G P on Apr 2, 2019
need to grind
John K on Mar 5, 2019
Great reviews and price.
Mary Anne O on Jan 22, 2019
Positive reviews
Frank A on Dec 4, 2018
The reviews were great, called and received excellent help from the employee over the phone who answered my questions about this item, and it was in my price range
Lauren A L on Nov 29, 2018
want to bea able to just buy big sacks of unmilled grain in the future
Rory D on Nov 25, 2018
Need it for Brewery. Ours died. Will also use for home brewing maybe
Nathan Todd on Nov 17, 2018
Heard it was the best out there
Jonathan M on Oct 1, 2018
researched mills and settled on this one
Randall S on Sep 21, 2018
they are supposed to be the best out there for homebrewers
daniel l g on Sep 21, 2018
great reviews and we need a grain mill, our local beer making supplier is getting out of the business.
Carol B on Sep 14, 2018
Product had very high ratings
Michael A on Aug 30, 2018
To have the ability to mill grain at desired crush settings (i.e. more finely than in LHBS)
Brian T on Aug 28, 2018
Comes highly recommended. Looking for a long-lasting, quality mill
Jonathan G on Aug 8, 2018
Decided to upgrade from a barley crusher-expecting a more consistent crush and better efficiency.
Bill K on Jul 31, 2018
need a new mill and don't want another sub par piece of equipment
Clive D on Jul 14, 2018
Reputation and quality of product. Price was the best I could find, and I like Morebeer.
John H on Jul 2, 2018
well reviewed. fast milling. my BC is dying.
charles bland on Jun 26, 2018
used one at local brew shop/ plus reviews
jerry b on Jun 26, 2018
The 3 rollers and positive feedback from others that purchased.
Robert M on May 22, 2018
The best mill around
Mlle H M on May 8, 2018
Looking to start going bulk with the flagship homebrews
Scott Christensen on May 11, 2020
3 rollers is superior, and I need to crush my own grain during the pandemic
Paul E on Apr 21, 2020
Can this mill be used with the high torque motor?
Kirk D Fabbri on Sep 28, 2018
Monster Mill MM3 - Complete 3 Roller Mill Packages
Monster Mill MM3 - Complete 3 Roller Mill Packages
Malt Muncher High Torque Motor
Malt Muncher High Torque Motor
BEST ANSWER: Yes, but the mill and the motor don't have the same size shafts. So, you'll need to buy a flexible shaft coupling hub that'll allow you to match the two different size shafts. McMaster Carr sells them online. Their part number is 6408k14. You'll need two, one with 3/8" diameter and one with 12mm diameter. Then you'll need part 6408k75 to hold them together. Hope that helps.
How tall is the assembly with the extension?
Daniel Clark on May 6, 2020
BEST ANSWER: From very bottom of included wood board plate to top of stock hopper is 14 inches tall, and from very bottom of the base to top of the extension is 23 inches, so the extension adds 9 inches, cheers
What are the dimensions of the wood board? I would like to be able to set this on top of my 30G mash tun.
Daniel Clark on May 6, 2020
BEST ANSWER: The board that came with mine (about a year ago) is 12" square, with the hole toward one edge (so you can swing a handle).

(NOTE, I have since remounted mine on a larger board, so I could mount a motor.)
Can this mill down to flour size?
Roy Baker on Apr 22, 2020
Yes! I brew BIAB and you can definitely mill to flour if you want. Just make sure you have a hi torque slow speed drill to run it, and if you’re milling wheat in your grain bill, be sure to mix it real well or it can bind and stall your mill.
Also, be sure to recheck your mill gap before you use it. Mine has wandered, but only on one side. Hope this helps.
What is the capacity without the hopper extension?
JEFF M on Oct 4, 2018
BEST ANSWER: 11lbs. Awesome Mill too, never had any issues
What are the dimensions of the base rollers? I'm retiring my Captain Crush mill and would like to adapt my hopper to MM3. Cheers!
Dick Rogers on May 27, 2020
BEST ANSWER: The rollers themselves on this mill are 1 1/2", I imagine you're more interested in the dimensions of the roller housing for adapting a hopper though. They are 3 1/2" wide, 7" deep, and 3 3/8" tall.

4.8 / 5.0
24 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Excellent mill
I’ve used a cheap 2 roller mill for the last few years and this is so much reliable and so much faster. If you thinking about making the upgrade to a 3 roller mill you won’t be disappointed.
April 18, 2020
2 months ago
This thing is amazing
I had a two roller mill and wanted to upgrade. Let me tell you, this did not disappoint. Out of the box and got it set up in no time. The first thing i noticed was the sheer weight of this thing. I loaded it up with grain and fired it up. It shewed through it like the grain wasn't even there. The only bad mark I can give this is with the wooden base it comes with. I use a bucket to mill my grains. My cheap 2roller mill came with stoppers that held the wood in place. It was a nice addition to have that this one does not come with. Not a knock, just an observation. Overall I love this thing.
October 2, 2019
12 months ago
Monster Mill
I have so far only done a test crush on a few pounds of grain. I was impressed with the result. Nice crush of the kernel, leaving the husk intact. I'm looking forward to using it in an actual brewl
September 12, 2019
9 months ago
3 Roler Mill
This mill does everything it's supposed to do. ,Love it. I put the hopper together with pop rivets which makes a smoother surface. Great mill.
July 22, 2019
11 months ago
One of the best Mills around
Very well built and works like a charm
July 3, 2019
11 months ago
Had some problems on first use
Had intermittent issues getting this mill to pull in the grain after following Monster's MM3 setup videos for the mill and gap. Had the mill mounted square, had a consistent gap across, and verified all rollers could spin freely. First test run with 1-2lbs of grain went through fine. After filling the hopper with 11lbs shortly after, it started to feed some grain through for a maybe a couple seconds, then stopped taking the grain. Found similar cases online. Some suggested the mill was not square, the gap setting might not be even, or that grain particles could be getting between the roller and side plate, and binding up the free spinning roller. I ended up loosening the mill mounting bolts a little to give it some play, and was eventually able to get the mill to pull all the grain through continuously. I haven't used it again since, so my best guess is that the mounting position is highly sensitive to the side plates being a little too snug to the rollers, or perhaps just the slightest bit out of square. Not impressed so far, but hopefully this is all just user error on the setup, and I'll be able to get it to work.consistently going forward.
June 5, 2019
1 year ago
Love it!
Works like a charm! (Slight height difference in the motor & the MM3 even with the included bamboo board, fixed with what I had though) Love this thing. You have to adjust the gap with the hopper off. Not that bad since I won’t change the gap frequently at all. Assembly was easy and it even with the motor at 200rpm it still chews through grain quickly with a nice crush.
Works like a charm! (Slight height difference in the motor & the MM3, fixed with what I had though)
Works like a charm! (Slight height difference in the motor & the MM3, fixed with what I had though)
May 18, 2019
1 year ago
Best investment thus far
Probably the best investment so far, leading up to this point I have been having a lot of trouble with undershooting gravities, beersmith showing mash efficiencies of 51, after buying this mill and tuning the crush, I now hit 81% mash efficiency and my target gravities, giving me more confidence! Not hard to put together, tho the instructions are lacking if I am to be honest.
The extended hopper is well worth the upgrade
User submitted image
May 14, 2019
Monster MM3
Some reviewers have complained of the level of difficulty in putting the hopper together. Didn't really have any difficulty with the assembly. #1 Phillips and a 11/32 socket were the only tools needed to get the hopper together. The included exploded diagram shows how it all fits together. Just take your time . Screw heads on the outside, nuts on the inside.
While it may not bother some, consider running a file along the edges of the hopper pieces to smooth out some rough spots - nothing serious, just a few swipes with a mill file. (It's just stamped sheet metal.)
The mill itself comes assembled. Check the Monster Mill website for a very thorough tutorial on mounting the mill, adjusting the side blocks for proper operation. It also shows how to adjust the rollers for the desired gap. The visual in that video is much easier to follow than the printed instructions.
Before putting the hopper in place, set the gap, check end play and how freely the rollers spin. Again, all in that Monster Mill video and probably all over You Tube. I also took an old paint brush with stiff bristles to the rollers to remove metal flecks still left over from the machining process.
Good purchase. Very happy with it. Would do it again, but probably won't need to do so for a long, long time.
April 20, 2019
1 year ago
Response from MoreFlavor
Thank you so much for your feedback. We really appreciate the honesty and value great feedback like this as it helps us improve our products as well as lending direction to other customers. Cheers!
April 22, 2019
Tyler W Staff
Monster mill MM3 does the job
I 100% love it. Finally able to hit the efficiency expected. Arrived quick and easy to assemble and adjust the gap. Very satisfied.
December 25, 2018
1 year ago