The extruder heatsink is a 40×40×11 mm gold anodised aluminium heat sink designed to keep the hot end of a Makerbot MK7/MK8 extruder cool and prevent heat creep during printing. Fitting a Makerbot extruder heatsink gold between the hot end and the extruder body blocks heat from travelling up the filament path. In addition, the gold anodised finish improves radiative heat dissipation compared to bare aluminium, helping maintain a consistent cold zone during long prints. The machined thread fits the standard M3 mounting pattern used on MK7 and MK8 assemblies. Key Features of the Makerbot Extruder Heatsink Dimensions: 40 mm × 40 mm × 11 mm — direct fit for MK7/MK8 extruder cold end Gold Anodised aluminium — better heat radiation than bare metal Machined fins and threaded mount for a secure, well-fitting installation Prevents heat creep — keeps the cold zone cool to avoid filament jams Compatible with Makerbot Replicator and MK7/MK8-based 3D printers Use Cases Replacing a worn or missing heatsink on a Makerbot MK7/MK8 extruder Upgrading to a gold anodised finish to reduce jamming during high-temperature printing Reprap and clone builds using MK8 hot end and extruder components High-temperature filament printing where cold-end thermal management matters Works Well With 40×40×11mm MK8 Heatsink — Black — the same heatsink in black anodised for a more understated look 50mm Axial Cooling Fan 5V/12V/24V — pair with a 50mm fan for active cooling of the extruder cold end Project Ideas & Tutorials Custom 3D Printer Extruder — Instructables — walks through building a 3D printer extruder cold end and fitting the heatsink to prevent heat creep Motor Heat Sink: When and How to Add Cooling — Zbotic — explains when heatsinks are needed and how to attach them to motor drivers and ICs Package Contents 1 × 40×40×11mm gold anodised aluminium heatsink