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spumco wrote:

So I stumbled across this video of the MX1500...

• • • • • 
          Have they already cracked the S-curve nut Grotius and friends have been agonizing over?
          How far has Pathpilot diverged from LCNC?
          Would it even be possible to merge some of the wizardry which appears to be happening in Pathpilot?
          
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Short answer is, yes. It has jerk limiting in some form. 

The tp source is not available yet as far as I've been told.
I have also been told its pretty far deviated, so it will not be a simplistic task to add it to the main.

This is just 4th hand information though, and I know nothing about coding so take that for what it's worth

What current are they set to?
I have mine at 2A in a shop that gets to 55 degree C in the summer (around 0 right now) and had no issues with them, but i would venture a guess that the one faulting has the chip not laying flat on the cooler, so open it and check if the board/chip are flat and the thermal pad is in place.
Mind you, as a general prevention i did open all of them and also added thermal paste between the chip and pad and heatsink and pad.
All on closed enclosures with no fans.