Category Archives: Stir Plates

New Yeastir DIY Stir Plate Kit + 15% Off Yeastir Site Wide

Yeastir DIY Stir Plate

Yeastir has announced the availability of a new DIY Stir Plate Kit

The new DIY kit includes:

  • 80mm fan w/ magnets premounted (no gluing required!)
  • 3D printed magnet mount & protective magnet cover
  • 3D printed platform (strong enough to support 5 liters of wort)
  • 3/4″ stir bar
  • Just attach 12 volts and you are ready to go!

To celebrate the release of Yeastir is offering Homebrew Finds Readers 15% Off Site Wide.  That applies to the ready made Yeastir Stir Plate (singles and 4 packs) and the new kit.

Use coupon diy_15 to get the deal.  Note that there is limited availability of the new DIY kit.  The discount is valid while supplies last.

Check it out – Here - Remember to use promo code diy_15

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Recent Great Deals:

StirStarter Stir Plate – $42 Shipped

This has been re-listed…

StirStarter Stir Plate eBay

StirStarter Stir Plate for $42 + Free Expedited Shipping via eBay.  Check it out – Here

RiteBrew has this for $39.99 + Shipping.  Most likely the $42 eBay offering will be lower when factoring in shipping, but it may be worth a check.  If you need something else beyond the stir plate, A RiteBrew order is probably the way to go.  Check out recently featured items.

I’ve used the StirStarter for years and it has worked very well for me.  I can wholeheartedly recommend it to you.

Related: StirStarter for $39.99 · Magnetic Stir Bar Plain PTFE 6 x 25mm · DIY Stir Plate

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Also Consider:

Ends Soon: 10% Off Yeastir – The USB Stir Plate

Yeastir Stir Plate USB

Yeastir stir plates run off any USB power Supply.  They include… the stir plate, a 2 amp USB power supply and a 3/4″ stir bar.

Features:

  • Runs off any USB Power Source
  • Includes 2 Amp USB Adapter for Maximum Performance
  • Sports a low profile… Easy to store
  • Includes a 3/4″ Stir Bar
  • Large 9″ Base fits mosts flasks – perfect for 2L Starters, Supports up to 5L Flasks

Yeastir USB Stir Plates sell for $59.95.  Use coupon code hbf_10 at checkout will take $6 off at checkout.

Check it out – Here – remember to use code hbf_10

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Also Consider:

10% Off the HBF Magnet Mounting Thingy? – YMMV

The HBF Magnet Mounting Thingy is designed to allow you to easily and accurately mount these magnets to this fan for use as a stir plate.  Read the Full Write Up.

The STL file is available for free if you have access to a 3D printer.  See the full write up for that file.

The magnet mounting aid is also available for purchase via Shapeways.  Check that out – Here

I purchased two of those myself.  At some point I went back to Shapeways and added several to my cart to see if shipping is flat rate (it does appear to be flat rate).  Anyway, I didn’t check out because I already have two on the way.  Within a day or two, I received this email offering me 10% off.

YMMV – Your mileage may vary on this one.  I’m not certain you’ll get the 10% off offer.  If you do want to try this, I would sign up for a Shapeways account first and then add the magnet mounting thingy to your cart.

Pinned: Scale Deal · Keg Sale · Hops from $11 · Erlenmeyer · $24:Drip Tray

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Recent Great Deals:

10% Off Yeastir – The USB Stir Plate

Yeastir Stir Plate USB

Yeastir stir plates run off any USB power Supply.  They include… the stir plate, a 2 amp USB power supply and a 3/4″ stir bar.

Features:

  • Runs off any USB Power Source
  • Includes 2 Amp USB Adapter for Maximum Performance
  • Sports a low profile… Easy to store
  • Includes a 3/4″ Stir Bar
  • Large 9″ Base fits mosts flasks – perfect for 2L Starters, Supports up to 5L Flasks

Yeastir USB Stir Plates sell for $59.95.  Use coupon code hbf_10 at checkout will take $6 off at checkout.

Check it out – Here – remember to use code hbf_10

Pinned: Scale Deal · Keg Sale · Hops from $11 · Erlenmeyer · $24:Drip Tray

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Also Consider:

pst:nr

Homebrew Finds Magnet Mounting Thingy… Available for Sale on Shapeways!

Homebrew Finds Magnet Mounting Thingy

The HBF Magnet Mounting Thingy is designed to allow you to easily and accurately mount these magnets to this fan for use as a stir plate.  Read the Full Write Up.

I had several people contact me about purchasing one of these or otherwise making them available publicly.  Note that I’m already providing the STL file for free to those of you with access to a 3D printer.  See the full write up for that file.

A serendipitous reading of an article about a legal controversy regarding a 3D printed “Left Shark” led me to 3D vendor… shapeways.  As always… thanks go to “Left Shark” :)

Shapeways, prints and delivers 3D creations.  Whammo.

The HBF Magnet Mounting Thingy is now available on Shapeways.  It’s available in white and black.  White material cost is $1 lower.  I ordered a copy and will see how it turns out.

Check it out – Here

DIY Stir PlateHere is a test of 1.6 Liters of water in a 2 Liter Flask – More about the Magnet Mounting Thingy

BYKES 10 Neodymium Super Strong Extremly Powerful Rare Earth Refrigerator Magnets 1/2 x 1/8 Inch Disc N48

SEOH Magnetic Stir Bar Plain PTFE 6 x 25mm New

XYZprinting Da Vinci 1.0 3D Printer

Stir Plate Magnet Mounting-Thingy STL files on thingiverse

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Recent Great Deals:

3D Printed Stir Plate Magnet Mounting-Thingy! with Videos

3D Printed Stir Plate

You probably know that since getting my XYZPrinting Da Vinci 3D Printer I’ve been on a quest to come up with a 3D printed stir plate design.  Note that these projects are certainly already out there (including designs specifically for mounting magnets on fans), but these designs are typically – “here’s what I put together with stuff around my house”.  That’s great, but it’s hard to nail down what works with what.  My goal was to use use known part numbers and a set procedure to come up with an effective design.

Well… I’m not done yet.  I am working with Brandon, a very talented Engineer (and HBF Reader!), on the larger project.

But… I can tell you that I’ve come up with a pretty amazing magnet mount, magnet, stir bar and fan combo.

First, the fan…

AC Infinity AI-120SCX Speed Control Fan Kit for Cabinet Cooling, Single 120mm

I sourced this specific cooling fan for the project.  I like this model because… 1. It’s a good size (4.7″ square), 2. Is already wired for AC and, 3. Includes a variable speed function.

AC Infinity AI-120SCX Speed Control Fan Kit for Cabinet Cooling, Single 120mm

Printing the Magnet Mounting-Thingy…

3D Printed Stir PlateHere it is printing on my XYZprinting Da Vinci 1.0 3D Printer – check below for links to the STL file on thingiverse.

3D Printed Stir PlateHere is the completed Magnet-mounting-thingy!

3D Printed Stir PlateA close up of the finished piece.  I tried several designs.  Magnet alignment is an important part of stir plate design.  Uneven or mis-spaced magnets mean easily thrown stir bars.  That’s not good.  I figured that out on my own, trying to place magnets isn’t fun.  They don’t want to cooperate.  This piece helps mount magnets and do so easily.  I decided on the hole in the middle because the fan I purchased has a dimple in the exact center.  The magnets are centered and held in place here and alignment on the fan is as easy as lining up the dot in the center of the circle.  Note that the two spots for magnets are designed to work with these specific 1/2″ by 1/8″ neodymium magnets.

Although I have Solidworks, I’m still new to 3D designing.  I designed this piece in the free version of SketchUp.

Magnets and Magnet Alignment…

BYKES 10 Neodymium Super Strong Extremly Powerful Rare Earth Refrigerator Magnets 1/2 x 1/8 Inch Disc N48About the magnets… I tried three different sizes of magnets.  I was about to go with a smaller size that worked okay, but decided I wasn’t happy with their performance.  Yes they did work on a moderately sized starter.  But, I just wanted more holding power.  I didn’t want to have to struggle with thrown stir bars.  I decided on these 1/2″ by 1/8″ Neodymimum Rare Earth Magnets.  If any magic exists in this design… certainly a good bit of it comes from these magnets.  The alignment and fan are both huge parts to the puzzle.  But the power of these magnets is central.

Note: Be careful with these magnets.  Read the warning on the box and always follow manufacturer’s instructions.  Take special care when using these around each other and around metal in general.

Stir Plate Magnet AlignmentYou want to line your magnets up so that the polarity is in agreement.  I’ve done this a few times now, not always successfully I might add.  Now, I start by putting the magnet on a stir bar.  Get it placed so everything is nice and happy.  I put this on Ritebrew’s Tasting Paddle.  I’m working on my deep freeze here and the magnet would prefer to make friends with the deep freeze vs the stir bar.  The tasting paddle helps.  Note that here and throughout these tests, I’m using this 6 x 25 mm Stir Bar.

Stir Plate Magnet PlacementNow take the stir bar and magnet combo and place it into the holder.

Stir Plate MagnetsWhen you’re comfortable with positioning, glue the first magnet down.  I’ve been using Gorilla’s Super Glue.  Wait for that first magnet to set up.  It’s worth noting that the individual magnet holders are tight enough (at least for me) for this specific magnet to hold them, at least temporarily, in place while you play around with positioning.

Stir Plate MagnetsNext, I take the other magnet and move it close to where it needs to go.  See how the stir bar has moved to the side?  That’s because the polarity was incorrect.  The stir bar was repelled.  Rotate the magnet around until the stir bar is attracted and you’ve found the correct position.

Stir plate magnet orientationHere, I’ve found the correct orientation for both magnets and the stir bar is attaching perfectly.  Glue the second magnet into place and wait for it to set up.

Mounting the Mounting-Thingy on the fan…

DIY Stir PlateNotice the dimple in the middle of this fan.  Disregard the scuffing on this.  I’ve tried a bunch of things with this fan.  The fact that it’s still working well after the paces I’ve put it through is a testament to it’s hardiness.

DIY Stir PlateAdd some glue and line up the dimple in the center section and whammo you’re lined up and installed.

DIY 3D Stir Plate Home BrewingInstalled and aligned correctly using the center circle as a guide

Stir PlateWith a temporary top installed.  Note that the actual enclosure for this stir plate is a work in progress.  This is a temporary platform and will not be the final design.

Tests…

With some stir plates, it’s necessary to move the flask around a bit (with the stir bar in it) to train up the stir bar on the stir plates magnets.  Not necessary with this design.  Drop the stir bar in and the two immediately find each other.

DIY Stir PlateHere is a test of 1.6 Liters of water in a 2 Liter Flask

1.6 Liter StarterHere’s another picture of of the same test.  This is vigorous and violent.  It’s worth noting that this magnet/spacing/stir bar combination doesn’t throw stir bars (at least in my tests) even at top speed.

Here’s a video of the 1.6 Liter Test

5L Stir PlateThis setup is entirely capable of holding a 5 liter Erlenemeyer and stirring large starters.  Here is a beautiful vortex in a 4 Liter flask of water.

A video of the 4L Test

5 Liter StarterHow about a full 5 Liter starter?  Yup!

I’m very happy with these results.  Look for a complete design in the near future.  I also plan to develop a non-3D version at some point.  The fundamentals of this hold true however they are put together… the fan, magnets and magnet positions are winners.  Want to work with me on the traditional design?  Send me an email.

BYKES 10 Neodymium Super Strong Extremly Powerful Rare Earth Refrigerator Magnets 1/2 x 1/8 Inch Disc N48

SEOH Magnetic Stir Bar Plain PTFE 6 x 25mm New

XYZprinting Da Vinci 1.0 3D Printer

Stir Plate Magnet Mounting-Thingy STL files on thingiverse

Update: HBF Magnet Mounting Thingy now available for purchase on Shapeways

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Recent Great Deals: