3D-printable replica of a mulching blade that could be printed in ABS-GF or PC? The design could include holes along the edges where small metal blades are mounted and exposed just enough to mimic the cutting edge of a real mulching blade. The main goal would be to recreate the lift and cutting action of a mulching blade while using a lightweight plastic body. Since the main structure would be plastic, it would likely fail first if it hit something hard, potentially reducing damage or risk. I also came across blades with two mounting holes, which seem like they would work really well for this concept.
Like these?
There is a new second design on Thingiverse search Yarbo.
I will am going to try to get a third design done today - maybe something modular enough for people to build their own ideas from.
Going to 3d scan the existing plastic disks to get the measurements so I can keep it properly bounded
Looking forward to seeing it.
That is beautiful, a true work of art. For the love of God, please send me two sets….
I have ordered my Yarbo and whilst eagerly awaiting it’s arrival, I have been doing some 3d print designs. Printing some mulching blades in 316L Stainless Steel is my plan or even 17-4PH which is a much harder steel. I have not been able to do these yet as I need the originals to measure from but it is on my list of things to do. In the meantime I have designed a tow hitch to be 3d printed in stainless steel (I have printed loads in stainless via a company in China - great results) but I cannot get it made yet as again don’t have an original tow hitch to measure. I include the designs and dimensions, if anyone who has one can measure the tow hitch please to see if it would fit, I would be most grateful. If it works and people like it, happy to share the design, as I will with the mulching blades when I make those up. Hope it helps someone!
similar concept but with 2 blade design with 2 hole razor blades installed on the edge with lift wings.
if you can scan the mulching blades, that is what I was thinking, they will be lighter with less plastic and can have lift wings.
Both of your designs look great. My only concern is whether they can generate enough lift. The Yarbo Pro mulching blade design uses winged edges to create upward airflow that lifts the grass before cutting. One of the main issues with the Yarbo mower (non-Core version) is the lack of lift — the grass has to be completely dry for the cutting discs to work effectively.
If we could create a 3D-printed version of the Yarbo Pro mulching blade and mount replaceable razor blades along the edges, it could achieve the same cutting and lifting effect while remaining lightweight. It would also have a sort of “kamikaze” function, where the printed body would fail first on impact instead of damaging the mower itself.
The reason I propose plastic mulching blade with razot blades as cutting edge is due to non-pro mower motor power and blades will be destroyed before it damage motor on impact.
great design and great work @laudav1285. wish if there is 3rd version with 2 wing design with some lifting twist.
I thought about inserting a blade edge but the annealed plastic seems surprisingly durable.
I have an idea that may demonstrate the lift or not of my design. I am experimenting tomorrow.
If it doesn’t rain 
love your commitment. great efforts already. Thank You.
I’m a retired nerd. Anything to keep my mind active 
Ah I see, sorry I was thinking more for the mower pro. When I get my pro I plan to design new blades and see what tweaks I can make to them.
So I wanted to see how far I could push this design.
I set the cut height to 3.8 cm (1.5 inches) and did a half acre. At some point it hit a rock breaking the end.
The take aways are:
1.5 inches might be too low, although the cut looked great.
The annealed plastic cutting edges stood up great.
You can see how the plastic crystalized during the annealing process.
And for the warranty minded it is not indestructible, so it is still sacrificial.
This is great work. Thank you