For those of you who’ve wired directly into the on board power, can you clarify which terminals you landed on? Ran across something interesting during a recent upgrade session on my Taz 4. I upgraded to the V2 single extruder, and while I was inside the control box, I went ahead and decided to tie my LED light strips into the onboard 24V power. I tied into the main power supply input terminals and ran wires out through two of the spare terminal posts in the XZ connector, and then up to a rocker switch, and finally to my lights. I chose to tie into the topmost power, which in hindsight appears to have been a bad idea. The lights work/look great, but my prints immediately went to garbage. Bad prints under really great light look 100x worse, BTW. My Z-axis in particular seemed to go crazy, and couldn’t keep track of steps. 20mm calibration cubes were coming out around 15.5mm tall. X/Y dimension seemed close, but were bulging due to the bulging from the compressed Z layers. I broke my cardinal rule and made multiple changes during one overhaul, making troubleshooting a challenge.
Didn’t think the new extruder should really have any impact on Z axis travel, so suspected the lights creating interference with the steppers. In pulling up the RAMBo manual, I see that the power I tied into also feeds the logic and motors. Assume the LEDs or running the power wire in the same cable bundle as the other XZ connector port wires are creating some sort of interference, because I pulled the two wires I landed back off, and ran some more calibration cubes and all is back to normal.
I’ve seen a couple references to auxiliary 24V power outs on the board, but I’m not sure on the exact locations/specs, or if the Aux power out is turned on by default, and also not sure if it is 24V by default. I see piercet’s post in this thread referencing the main power supply, wondering if you chose the lower two terminals, which I think power the heated bed, or if you routed wires in a different fashion, avoiding the potential power/signal wire bundling I did?
Looking for any thoughts from guys who’ve had success pulling 24V out of the control box to run LEDs?