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Step 7Prepare the Flat Top Bit
Work out how long you want your cone of silence.
If, like me, you are using 2.4m long sheets of PETG, you will want the total length to be no more than about 2 metres, so that a 2.4m length can reach from end to end, allowing for the curvature of the domes.
Assuming that the domes segments are 20cm wide at the base, the total perimeter of the cone of silence will be 6x20cm plus 2x the length of the striaght edge.
For a skirt made of 2x2.4m lengths, this means the straight edges must be less than 4.8 - 1.2 = 3.6m, or 1.8m each side.
But the top bit will be a bit shorter, because the domes will completely cover 20cm at each end, and partially cover the next part.
So, after all that, this means you need to cut a piece of PETG that is 146cm x 64cm.
Fold the long edges down to make a tab about 2cm wide on each side. This will be used to join the top to the skirt.
If, like me, you are using 2.4m long sheets of PETG, you will want the total length to be no more than about 2 metres, so that a 2.4m length can reach from end to end, allowing for the curvature of the domes.
Assuming that the domes segments are 20cm wide at the base, the total perimeter of the cone of silence will be 6x20cm plus 2x the length of the striaght edge.
For a skirt made of 2x2.4m lengths, this means the straight edges must be less than 4.8 - 1.2 = 3.6m, or 1.8m each side.
But the top bit will be a bit shorter, because the domes will completely cover 20cm at each end, and partially cover the next part.
So, after all that, this means you need to cut a piece of PETG that is 146cm x 64cm.
Fold the long edges down to make a tab about 2cm wide on each side. This will be used to join the top to the skirt.
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