I also made a new cover for the secondary. The old one wasn't 3D printed and used elastic bands to hold it in place. The elastic needed replacing from time to time as it would deteriorate from the heat under the tarp.
The blue parts are 3D printed with TPU filament and they hook onto the spider vanes. Remains to be seen how well they'll cope with the heat. If they fail, I will replace them with metal strips.
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