Protect and upgrade your 3D printer hotend with this Heating Block Silicone Cover (23x23x17 mm), crafted from flame-retardant silicone for reliable safety and performance. Acting as a protective “sock” for your hotend, it provides insulation that keeps temperatures stable, reduces heat loss, and speeds up warm-up times.This 3D printer hotend silicone sock also helps prevent melted filament from sticking and burning onto your heating block, keeping your hotend clean and easier to maintain. With its flame-retardant material, the cover adds an extra layer of safety, while its flexible design ensures a snug, tool-free fit.Perfect for both hobbyists and professionals, this flame-retardant silicone sock for hotend extends the lifespan of your heating block and delivers smoother, more consistent print results.