I have a printer of my own design with a 300mm^2 bed and the Y motor has trouble keeping the bed moving. It tends to miss steps when moving faster than about 30mm/s. I’ve currently got an 84oz/in stepper for Y. Which would be more effective at moving that big of a bed: upgrading to a DRV8825 and a 114oz/in stepper, or switching to 24V power?
What size pulley are you using?
When the belt is disconnected, does the bed move smoothly without much friction?
Does your belt drag on any other surfaces?
16t Gt2 belt. Its on V wheels and Vslot, and rolls very smooth when disconnected from the belt drive. its just big and heavy.
24V just makes sense. Go with that for a start.
Correct me if I’m wrong but if you just switch the power supply to 24V, you’re probably already using a motor with rated voltage 12V or less so it’s not like you’ll be supplying the motors with any extra power.
Need more info (eg motor specs) to evaluate this. Specifically the inductance and resistance. It’s possible 12v isn’t enough voltage to drive the motor that fast and maintain high torque. It’s also possible you’re not giving the motor enough current. It’s also possible your jerk/accel settings are too high for the bed mass.
https://www.amazon.com/gp/product/B00PNEQKC0/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 this is the motor i have now. I don’t know how to get inductance and resistance, Max accel is 120, max jerk is 20. I’ve tried changing those values around but still got skipped steps. The bed is quite heavy. I found some success by making the nozzle lift with each retraction, since that gets it up and away from the part. due to the way the hotend is mounted on the X carriage, if it starts to drag with the bed moving towards it, it will dig in deeper and get stuck. lift stops that happening.
Resistance and inductance are plenty low. At a glance 12v shouldn’t be a problem.
Probably just too much mass and drag for the motor. (That nozzle drag does sound like a mechanical problem to resolve though.) You could add a 2:1 pulley reduction stage or use a smaller drive pulley to get more force from the motor torque.
16t is the smallest Gt2 pulley i’ve found with a 5mm bore to mount direct to the stepper. I have a few ideas to resolve the nozzle drag. like I said lifting for every retraction seems to do the trick, but doesn’t help when i have a second nozzle(i designed this for dual extrusion) since the second nozzle will cross the current layer due to the offset. at which point it can drag. I think i’ll try a higher current driver and that whopper motor from e3d.
Try reducing the jerk since 20 seems a bit high. Make sure it is not being overridden in the header of your gcode.
Depends on the firmware version too. The latest versions of marlin changed the jerk code to per axis, and the default jerk is way too high at 20mm/s. I typically use 5mm/s.
I have a printer with a similar build plate and had similar issues when I first built it. I went to a 90oz stepper motor and fixed the issue. You may also want to check your voltage on the driver. If it’s too high you will skip steps from overheating, or too low and it will skip from mot enough power.