MECCANIXITY Copper Heatsink 6x6x5mm with Self Adhesive for IC Chipset Cooler Pack of 5

It does what it says on the tin. Dimensions are accurate, provides a adhesive pad for each heatsink and is perfectly sized for a TMC2208 stepper driver. They're asking $15 CAD for a tiny couple of heatsinks though. Its not even a palm-full.

Took ten degrees Celsius off my voltage regulator on Bitcoin miner when paired with a 40mm pwm fan at 70% speed. Adhesive pads work fine.

These do the job, not worried about such little money, great value for the price. Would buy again if needed.

After setting up a Prusa Enclosure for my printer (Which works VERY well, I will add...) I found that my printer would sometimes shift layers in both the X and Y axis. I did some searching and found a lot of claims that the Stepper Control Chips were likely getting hot from being in the enclosure and printing at hotter temps (PETG at about 250 for some super strong layer adhesion.) I planned to print some ducting to go with a fan, but that would entail designing, printing, testing for fit, wiring the fan, etc. These seemed like a quick and easy solution instead. The fit well. I tilted the printer on it's back a bit, moved some wires to expose the chips, and using a VERY small amount of thermal adhesive (I purchased something separate that is more like silicone caulk, rather than using the adhesive pads sold in this kit...), I stuck the heatsinks on. After a few hours I tilted it back up on it's feet and let it sit overnight. It's printing fine. I haven't REALLY tested for temps, but so far no layer shifting and it's printing as good as usual.

If you own or have built an open source 3D printer, you've probably got some form of canbus board on your toolhead. Said CANBUS toolhead board (Notably the Bigtreetech EBB Series) comes with a TMC2209 stepper driver and a comically oversized heatsink for it. These are the perfect size to cover that tiny little 2209 extruder driver chip on an EBB36. I have run the printer HOT (ambient enclosure temps in the neighborhood of 75-80c) for printing Carbon Fiber ASA, and this little heatsink has never skipped a beat. Temperature control is excellent. Some rough edges on the heatsinks themselves, and value for money is questionable for little pieces of copper like this. BUT The adhesive works well and I've never had any issues with the stepper driver overheating in VERY unforgiving environments. Functionality is on point!