I emailed him Bryan.
Thanks guys… have no idea that stuff is an issue.. really appreciate it
@laudav1285 I get royalties for spurring you to launch your new business. 
Is there someone making these for ordering? Seems like some folks were testing but I wouldn’t mind a set or 2
I can make you some but all I can say is they work better than the yarbo discs at mulching and the deck stays cleaner. Not as good as a my riding mower. No guarantee and no warranty. They are experimental.
I have a set printed. If you’re still interested they are $100.00 USD for two printed discs and shipping. I also need your name and address.
Dave
I have a two sets available to ship.
Thanks Dave for these blades. I tested them out and it is a perfect fir. I love the mulching part, that was bothering me with the original blades. And the seem very sturdy. I will leave them on all summer. Cheers
I think the next experiment will be to see if I can anneal the plastic. ( Heat to 200 F, 90C post print ) It may increase the strength by 30%.
It may also shrink the print, so it has to printed a about 4% bigger.
Any reports of it breaking?
I’ve been using mine for most of last season and the beginning of this one. I have not been preclearing sticks or other debris.
I noticed that cracks were starting around the outer bolt holes. I attribute them to the bolt/nut/blade movement during hard strikes. I think the addition of a second nut or a heat inserted threaded fastener, will strengthen the area.
Adding annealing should help as well.
Warming the oven up now. Much to my wife’s, unwarranted chagrin.
Very interesting. Learned something new today!
It’s like tempering glass or metal. It changes the plastics crystalline structure.
What material did you use to print them and what infill pattern was used? How many walls?
PETG. 100% infill. I am experimenting with annealing now.
10 hours at 0.2 MM layer height. With a 0.4mm nozzle.
What printer are you using?
Prusa MK 3+. I’ve had it for several years. Very reliable but expensive.