Mafell KSS 40 BL

mcfal12

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Joined
Nov 20, 2021
Messages
117
Yes it is expensive. No it is not for everyone. Now that that is out of the way….

I suspect many of you have had a similar journey with tools. Starting out, we could not afford or justify the cost of tools made by Festool, Mafell, Lamello, etc and so we purchased other brands. Then, after learning to use the tools we have at our disposal and accept (or are ignorant of the compromises we are making), we write those brands off as unnecessary and overpriced. Now I am in a place where I have revisited and used many of these brand’s offerings and realized in the long haul, I have spent more money and time, and my work quality has, at times, suffered. I am not ashamed to say looking back, I regret not investing in the best tool.

The above isn’t isolated to just tools. I can draw similar parallels to when I started playing paintball. I purchased what I could and, along the way, ended up spending more than having just invested in the best available Paintball marker. Perhaps this is unique to me, but I’m confident this will resonate with all of you.

So why am I saying this? Well, I recently reached a period of peak frustration on a walk-in closet installation in late 2022. Having been aware of the Mafell product line for some time and what their offerings were and recognizing how the Mafell KSS 40 18M BL would simplify and improve the quality of my work; while improving the quality of my life (more below) - in the long term I would’ve made more money and been happier had I purchased this saw sooner.

The Mafell KSS 40 18M BL is one of a kind. Festool’s HKC 55 has similar features, but having used it, it is not the same. To name a few differences, the HKC 55 is larger and doesn’t fit in a systainer… As with the Mafell, it is a quality, top-notch tool. Where the Mafell excels is that it is the right size, weight, compactness, and power to complete 90% of the work I do.

Further, the fact that Mafell is on the CAS platform means the battery Is compatible across hundreds of brands. The cutting capacity is sufficient to cut 2x material while on the guide rail. Splinter-free cuts in hardwoods and softwoods relieves stresses and concerns with tear-out on expensive materials. Time-saving features include a simplified blade-changing process and one dial miter cuts for speed and accuracy. As everything fits in a single box, all the necessary accessories are always within reach. Further efficiency is achieved on angle cuts by the turn and slide of a dial.

Will all that, the compactness and completeness of the package in itself would be stand-out features; it’s not until you pull out the Flexi-rail and cut down a door or large panel that TRUE appreciation of the engineering and design of this tool is experienced.

Allow me to get back to the improvement this tool brings to my quality of life. Jobs are less stressful; the cutting saw, guides, battery, chargers, etc, are in a single box. This equates to less stress over forgetting tools behind, and fewer trips in and out of a job means I finish my work sooner. The lighter form factor results in less fatigue, and better dust collection equals less cleanup and a safer working environment. The combined results are that I am more energetic when I get home and in a much better state of mind to enjoy my friends and family. It also means that over time I am more productive. Productivity = money.

And these are the peripherals of buying this tool.
Some are going to argue that the cost doesn’t outweigh the benefits. I’m not going to argue. Some may argue that the cutting depth creates limitations. Again, I am not going to argue. All tools, and life, comes with sacrifices. Some are going to argue that the saw can only through 2x material while on the guide rail. A 7-1/4” blade is overkill for cutting 2x and sheet goods and cannot cut 4x or 6x materials in a single pass (most aren’t cutting those sizes regularly anyway). As the saying goes, “the best saw is the one large enough to get the job done”.

I am not telling a DIY or homeowner that they cannot get tremendous results from their existing tools and methods. I am, however, advocating that as DIY’ers and homeowners tackle projects, they would be better off having the best quality tools and avoiding the compromises and pitfalls associated with “less expensive tools”. I am avoiding calling tool brands ‘inferior’ for a specific reason - most brands make the tools they feel reach their customer base. Ryobi, which I proudly use, knows that most people aren’t going to walk into a store and plop down $1,500 for a saw. As a result, they conduct the necessary engineering, research, and development to produce a quality product for their customer base.

To close...I purchased the KSS 40 18M BL with my own money and have not been compensated in any way. This is my opinion based on my experiences with this tool.
 
“the compactness and completeness of the package in itself would be stand-out features; it’s not until you pull out the Flexi-rail and cut down a door or large panel that TRUE appreciation of the engineering and design of this tool is experienced‘

I love it and I still haven’t used the Flex-rail.

One thing I really like is that it can stand up on the bench on it’s battery pack, ready to grip and use with just one hand.
 
I certainly like the package...everything in one place.

Can either of you compare the properties of it to the HKC other than the compactness?
Power...accuracy...ease of (fill in the blank).
 
Cheese said:
I certainly like the package...everything in one place.

Can either of you compare the properties of it to the HKC other than the compactness?
Power...accuracy...ease of (fill in the blank).

Ease of use: unbox, plug in a battery and cut. It’s intuitive, with the biggest learning curve being remembering to raise the guard fully if you want to disconnect the saw from the crosscut rail. The adjustments for angle cuts is straightforward.

Accuracy: my saw was perfectly square out of the box. It cuts cleanly and I’ve had no accuracy issues. In fact the design lends its to being accurate- especially on bevel cuts. Since there is a single connecting mechanism and not independent front and rear attachments (there are still tightening knobs in the front and back) when setting angles I’ve never had the cut turn out wrong because there was a nth degree difference between the front and back of the saw.

Power: powerful enough to easily cut PT 2x material and anything else I’ve thrown at it. People have complained about the HKC being underpowered, which I disagree with, so take my opion as such. What I have found is people complain when tools are pushed beyond their designed intent and then being vocal about it.

The flex rail is a game changer. My only wish is for a 120” version for ripping full 8’ sheets.

The truly on knock I have is the pitiful dust port and bag attachment. The dust port has a tapered end and the bag isn’t as secure as it should be. I’ve never had it fall off but the few times I don’t hook up extraction and use the bag; knocking it off is always on my mind.

 
I’ve never entered into an argument when the opposing viewpoint is that my tools are too expensive. I know why I’m buying them :)
 
Cheese said:
I certainly like the package...everything in one place.

Can either of you compare the properties of it to the HKC other than the compactness?
Power...accuracy...ease of (fill in the blank).

I had the HKC before getting the KSS.  I purchased it during a deck build where it's primary function was to miter and crosscut the decking boards.  Material was S4S plus Cumaru obtained thru Advantage Lumber.  Cumaru is very dense and hard and the HKC definitely struggled more with those cuts than did the KSS. As such you had to be more careful and slow down even more when mitering the boards with the HKC, or it might feather off the miter at times.  The deck was designed with an interior chevron surrounded by a squared off 120 cm wide border so there were a lot miters to cut. The KSS powered through all of those cuts without hesitation. 

The compactness and lighter weight also made it much more convenient to use, especially when crawling around in the framing of the deck which was situated at a little under a meter off the ground. FWIW, I find this particular height to be about the most difficult height to work on. It is much easier to get inside of and work in the framing of both shorter and taller decks.

As stated, having everything inside one systainer is great.  I find myself having to look at the lid insert, however, to remember which way the Flexi-rail goes in, as Mafell really maximizes the storage inside their offerings. The ability to store the saw while still attached to rail makes it much more convenient as one is able to just pull out the tool, nearly ready to go.  I say nearly ready because the battery must be removed from the saw when placing the tool in the systainer. Connecting the battery is the typical simple process one expects. I am not a fan of how they set up the battery release however.  I can typically pull a battery, one-handed, on all my other tools, including the cordless Mafell MT55 18 bl, but I end up using both hands on the KSS, due to the way the release is completely behind the area where the battery slides in.  One typically doesn't swap batteries enough though for this to be a show stopper.

Being part of the CAS system is great. I was able to pick up a package consisting of two 8 amh batteries, charger, and carrying bag,https://beavertools.com/us625342002...xUbhoUG3ild9jg7TRB85cZ-F6Ai9qsixoCMdsQAvD_BwE, that functions just as well as the stock Mafell battery.  The package is currently priced under $250 while a single Mafell 8 amh battery runs $320 by itself.  And I'm able to use all of my batteries interchangeably between my Mafell cordless tools.

The Flexi-guide rail is great. Yes, it would be nice if it were longer than 140 cm but with small form factor of the KSS 40, I find it easier to crosscut a 4' x 8' sheet of plywood than using the 1400 Festool rail and TSC 55.  Add in the fact it has the much more durable rubber edge strip that Mafell uses and it has tons to like. They also provide you a parallel guide fence for the saw that you will have to pay extra for, if you want one for your Festool.

Another annoyance I have noted is the need to raise the saw, (decrease the depth of cut), in order to remove the guide track. I like the control the tool provides for doing this adjustment, using a lever that raises and lowers the saw. It does take two steps though as one has to release a locking lever prior to adjusting the saw up or down.

I share the same thoughts as mcfal12 on the dustbag.  One convenient feature is a screw-on cap so the dustbag isn't dropping debris when stored inside the systainer.
 
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