Flat Refillable Ice Pack | Slim Cooling Block

Flat Refillable Ice Pack | Slim Cooling Block A slim reusable refillable ice pack designed for cooler bags, lunch boxes, camping, travel, outdoor family use, and simple DIY summer cooling setups. Fill it partly with water, leave enough empty space for ice expansion, freeze it, and use it as a flat cooling block. The slim rounded shape makes it easy to place inside a cooler bag, lunch bag, backpack pocket, or near small DIY cooling setups where a flatter ice pack is more convenient than a bulky block. This design uses a recessed filling area and a separate cap, helping keep the overall shape compact and easy to handle. Important: Do not fill completely. Water expands when frozen. Always leave empty space inside before freezing. This is a 3D printed container, so always test for leaks before using it near electronics, food, bags, or temperature-sensitive items. Recommended print settings: PETG or PLA Tough recommended 0.2 mm layer height 4 walls recommended for freezer use 25–40% infill 5–6 top/bottom layers Use a clean build plate Make sure the cap and filling area are printed cleanly before use Use ideas: Cooler bags Lunch bags Camping Travel Outdoor summer use DIY fan cooling setups Small cooling box setups More of my print-in-place designs: 👇