14 hours at typical 3D printer time would make that a very expensive bumper. Do you intend to use it as a fender or for mold to fabricate a fiberglass version?
Given that, I expect you intend to use it as is, therefore, be certain that you factor the retail price of a printed fender when you insure the bike.
Actually it is not that expensive if I order 5-10. I asked one guy, how is doing plastic molds/things, he sad that fender is to complicated to be made from one peace mold... But he sad it can be done but it would demand a lot of hours=money
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No expense spared! Very clean minimalist, look. Almost just floating ontop of the wheel. Nicely done mirko 
Thanks Paolo
What about the section that sits on the axle...? I wouldn't want to have plastic spacers in my front wheel, it wouldn't last long and be extremely dangerous....
It was designed to ride on the axle spacers if I am seeing it correctly. Or, the axle itself. It is not sandwiched between the axle and moving parts or between a bearing and spacer. Plastic, ABS especially isn't always a vibration resistant or resilient plastic.
Fender is sits on axle spacer. So no worry there
Original fender for GSXR is made from ABS plastic. But it is one peace mold. Weakest things in ABS 3d printed plastic are layers. When you take a closer look at my fender you can see layers of plastic. It will brake on those layers. Thats why I increased thickness everywhere and added metal support tubes. Top of the fender is 3.5mm thick. I tried to brake it at top and I could not.
I was thinking of adding one layer of carbon on the inside of the fender, just to be sure. Or better, print fender with lower thickness and add that carbon layer....
But major concern is distance from brake rotors. Fender can't move to much. If you look closer, where fender is touching(not actually touching) the forks, you can see that forks are behaving like guides for up/down fender movement. That restricts fender movement.
But rotors can get hot and this plastic is not that resistant on heat. So I am planing to add some kind of thin heat resistant layer on spots closest to rotors.
For my 750 project, I have an aluminum front fender that my buddy is fabricating round bar mounts to bolt onto the modern fork mount points. I like the idea of a more elegant solution to use on my 550/650 project.
Maybe you can be my best subject
. Fender is modeled for 18" tire of your size... I have also modeled it for 17" but will not be using it....
