I"m hoping this is the right forum for this question. Apologies if it should be in the Delta section.
I am trying to get a delta printer working reliably but can't seem to remove occasional missed steps.
I am confident that the mechanics of the printer are good.
There is no play in the effector mechanism (magnetic arms), movement is nice and smooth and homing is still accurate after not having calibrated it or changed anything on it for a couple of weeks.
It seems to print small pieces without any problems, but as soon as I attempt something which takes more than 10 minutes or so, I keep getting the occasional small layer shifting which leads me to think it is missing steps.
The RAMPS electronics are of dubious provenance, (I was given the printer as an almost finished project).
The A4988 stepper drivers are on red PCB and have an Rcs of 200.
I've tuned the Vref accordingly and the stepper motors do get borderline hot (about 68 degrees after an hour of printing)
Stepper motors are Minibea branded, 1.4A. (I've also tried a different set of steppers and the problem persists).
I'm wondering whether it is possible for the RAMPS board or A4988 clones to be bad in some way and be the cause of this?
Anyone ever come across this kind of issue with a RAMPS board? My other two printers use a Melzi and a Maker Base so I'm new to the replaceable A4988s.
Thanks.
Lapo
I am trying to get a delta printer working reliably but can't seem to remove occasional missed steps.
I am confident that the mechanics of the printer are good.
There is no play in the effector mechanism (magnetic arms), movement is nice and smooth and homing is still accurate after not having calibrated it or changed anything on it for a couple of weeks.
It seems to print small pieces without any problems, but as soon as I attempt something which takes more than 10 minutes or so, I keep getting the occasional small layer shifting which leads me to think it is missing steps.
The RAMPS electronics are of dubious provenance, (I was given the printer as an almost finished project).
The A4988 stepper drivers are on red PCB and have an Rcs of 200.
I've tuned the Vref accordingly and the stepper motors do get borderline hot (about 68 degrees after an hour of printing)
Stepper motors are Minibea branded, 1.4A. (I've also tried a different set of steppers and the problem persists).
I'm wondering whether it is possible for the RAMPS board or A4988 clones to be bad in some way and be the cause of this?
Anyone ever come across this kind of issue with a RAMPS board? My other two printers use a Melzi and a Maker Base so I'm new to the replaceable A4988s.
Thanks.
Lapo