! --Stepper direction

General Discussion
21

Just noticed the comment about the current - 2A is surprisingly high and is the maximum rated current for the TMC2209. I’m running my bed slinger with two NEMA 17s in parallel at 0.8A (the X & Y axis current is 0.6A).

I guess because the printer’s old you have additional resistance to overcome but that’s still pretty high (even at 1A per motor because its in parallel).

When the printer is running, you should be checking the temperature of the Z axis steppers and the TMC2209 driver to make sure you don’t end up with a literal meltdown.

22

That is something to think about. When I first got it running the via Klipper returned an 'over temp 'warning but there was no cooling fan on the board. Since adding a fan to it there has not been a problem. Doing a full travel -190mm and home again the heatsink doesn’t exceed 28.7 C as measured by a FLIR gun.

As I get closer to a working printer I may revisit this issue. With new M6 rods on the way it may require less run current.

1 Like