RE: 45mm heat sink for KB45-17XL 700kv motor
I checked the web site that you provided. It looks like a square, rather than desired circular tube shape.
Do you have pictures to show how this was attached to the motor?
maxiFLOW™ Heat Sink with maxiGRIP™Clip Attachment for Low Profile Components
ATS-51450K-C2-R0
maxiFLOW™ design features a low profile, spread fin array that maximizes surface area for more effective convection (air) cooling
maxiGRIP™ attachment applies steady, even pressure to the component and does not require holes in the PCB
Designed for low material profile components from 1.5 to 2.99mm