KC3KNM
Probably Wrong
After getting my L1 back in June, I've been excited to start on my L2 build. I've decided to go with the Madcow Level-2.
The motor mount is going to be a little... different. I abhor aligning fins and don't love making internal fillets. To get around this I've 3D printed an insert that the fins epoxy into. While it does add weight, it should make the entire assembly very rigid. It's been printed with CF PLA @ 10% infill. The fins will be epoxied into the slots which I think will provide a very rigid bond when everything is sandwiched together.
I did have an issue with delamination on the lower end. The rest of the print seems to have worked out well, so I cut the problem area off, sanded square and laser cut a cap for it. As it was a 12hr print, I'd like to avoid going through that again. The issue was localized to that area as the rest of the print is rigid. I'll keep an on eye on later prints and likely bump up my hotend temp (already at 230*C, so I'm not sure that was the cause), but in the end it's more of an irritant than a real issue.
I've laser cut some spacers to allow the entire assembly to butt up to the Aero Pack retainer as well as some doublers for the stock centering rings. I'd like to fly this on larger motors later on, so the idea is to spread out the force instead of localizing it to the stock two centering rings. I'm not a mechanical engineer, but I've done something similar with a 3D printed mount on my IRIS and that's stood up to an H550 very well with no signs of fatigue.
I wanted to provide a point to install my rail buttons to further up as well as provide a little support for the motor tube, so I've come up with this. It's very rigid and should work well. I forgot to grab a picture after assembling it, but you can see it it glued up on the motor mount assembly photo.
This is where I'm at now. Waiting on some epoxy to cure before giving a good sanding and installing into the body tube. I'll get a final weight of the assembly before install. I think it should provide a very solid mount, make the fins a breeze to install and hold up to some pretty large motors. We'll see how that goes.
The motor mount is going to be a little... different. I abhor aligning fins and don't love making internal fillets. To get around this I've 3D printed an insert that the fins epoxy into. While it does add weight, it should make the entire assembly very rigid. It's been printed with CF PLA @ 10% infill. The fins will be epoxied into the slots which I think will provide a very rigid bond when everything is sandwiched together.
I did have an issue with delamination on the lower end. The rest of the print seems to have worked out well, so I cut the problem area off, sanded square and laser cut a cap for it. As it was a 12hr print, I'd like to avoid going through that again. The issue was localized to that area as the rest of the print is rigid. I'll keep an on eye on later prints and likely bump up my hotend temp (already at 230*C, so I'm not sure that was the cause), but in the end it's more of an irritant than a real issue.
I've laser cut some spacers to allow the entire assembly to butt up to the Aero Pack retainer as well as some doublers for the stock centering rings. I'd like to fly this on larger motors later on, so the idea is to spread out the force instead of localizing it to the stock two centering rings. I'm not a mechanical engineer, but I've done something similar with a 3D printed mount on my IRIS and that's stood up to an H550 very well with no signs of fatigue.
I wanted to provide a point to install my rail buttons to further up as well as provide a little support for the motor tube, so I've come up with this. It's very rigid and should work well. I forgot to grab a picture after assembling it, but you can see it it glued up on the motor mount assembly photo.
This is where I'm at now. Waiting on some epoxy to cure before giving a good sanding and installing into the body tube. I'll get a final weight of the assembly before install. I think it should provide a very solid mount, make the fins a breeze to install and hold up to some pretty large motors. We'll see how that goes.
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