Folding Solar Mug & Jar Warmer: foil reflector panels (PETG/ASA)

**What you need (not included):** Kitchen foil, cereal-box card (4 trapezoids, each cut to the size of the panel face rebate), glue stick, 4 bamboo skewers or 1.75 mm filament offcuts (hinge pins, 3 mm), 4 binder clips, a dark mug or jar with a lid. **How it works:** Glue foil to the cards and press them into the panel rebates, shiny side up. Push a skewer through each panel knuckle and the matching base knuckles. Raise the panels to about 60 deg, where the edges meet, and clip the corners with…

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