Arms Finished Printing and Change of Colour Scheme

I’ve been using CAD models and renders in white plastic the whole time, but a while back you may have noticed that I switched to using grey plastic when it actually came to the 3D printing. The main reason for this is that I’d been having some trouble with the surface finish of the white PLA, and as I knew that grey worked I stuck with it for then.

I’d been planning to stay with grey for the rest of the quad, giving it a nice smart, industrial finish, however I hadn’t anticipated how much filament I would have to use and after printing the second arm it was evident that I wouldn’t have enough to print any more.
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Final Design for Main Frame Centre

Right after modelling the main parametrics of the frame, I’ve gone on to make it ready for 3D printing.

First, I have added screw holes in the bottom of the frame for attachment of a battery holder, and I slightly thickened the top of the walls on the long sides to allow room for embedded nuts for attachment of a lid.

Here’s the bottom:

8 screw holes on the bottom for attachment of a battery holder.
8 screw holes on the bottom for attachment of a battery holder.

I may not use all 8 screws, but I have put all the holes there in case I do need to.

For the top I have modelled in four hexagonal cavities for nuts to be embedded in, as you can see in this section analysis:

Section analysis of top of frame
Section analysis of top of frame – the long walls had to be thickened to make space for the nuts

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Internal Components CAD Mockup

Following my last post, I’ve begun to model the actual inside of the quadcopter into CAD software. It’s very important to me that the various boards and parts are all mounted very securely using screws and are neatly arranged, and so I’m modelling the inside first, to determine the exact amount of space I need, and I’ll design the rest of the casing from that.

Here’s a render of the inside of the casing as I’ve modelled it:

Rendered with Autodesk Fusion 360
Rendered with Autodesk Fusion 360

This is the result of much deliberating over how to position the screw mounts for each board.
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