CAD Design for Arm

Now that the main body is done, the next step is the arms. Now I know exactly how they have to fit into the frame, because I designed the fitting earlier, and the female part of this is already built into the frame centre.

The first problem I noticed is that the radius of the propellers I’ll be using is about 130mm – the same as the length I had set between the body and the motor centre. The frame is angled so that motors this distance from the frame will be equidistant, but I obviously need some clearance between the propellers and the frame, and so I have regretfully extended the arm length to 160mm to allow for this.
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Print of Main Frame Centre

The main frame centre has now finished printing, and it’s come out nicely. I had one failed print, where because I didn’t have any glue to put on the print bed, the corners warped to the extent that it would have been impossible to actually attach anything to the bottom:

Warped edge on left
Warped edge on left – you can see the shadow underneath

So I added lots of pritt stick (the recommended way to make prints stick better) to the bed, raised the bed temperature from 60 to 75deg, and tried again.

It came out perfectly:

Perfect print of main body
Perfect print of main body

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