I think the drivers are the exact same part on the RAMPS and RUMBA, so I expect the requirement is the same.

Will be interesting to point the IR sensor at the drivers once things are up and running...

(Forgot to mention: Colin is updating the RUMBA wiring guide to include the power supply related instructions)

Quote Originally Posted by TopJimmyCooks View Post
Not experienced with Rumba but on ramps those heat sinks are definitely needed with the stock stepper drivers. And, if you want to print for hours on end reliably you need some kind of fan blowing on them.