Unfortunately, these machines tend to jam a LOT. You can try running the print slower, cleaning the bowden tube, or using slower retraction settings to see if that helps, but I think a lot of it is just due to the poor extruder design. So it's hard to completely avoid it.
It's just I dont get any jams with either PLA / ABS using their own software (its about the only plus to it)
So I just wondered if anyone else had that problem with PLA? I wonder if its running too hot? But Im using the prebuilt profile that comes with S3D, which is definitely lower temperatures that the ABS.
However, my PLA is over a year old, would that make a difference?
The CubePro does jam ALOT. There are 3 main factors that influence this frequency.
These all apply for unmodified units, if they still exist out there..
1. The chamber heater should absolutely be turned OFF for PLA.
2. The aluminum extruder body conducts a HUGE amount of heat from the stepper motor into the filament area. This heat can soften the material before it reaches the hot-end. THIS CAUSES LOTS OF JAMS--ESPECIALLY when coupled with #1.
3. There is a LOT of tubing for the extruder to pull filament thru. If the heater is on and the filament is softened by the extruder, there is less chance for the machine to pull the filament through the tubing.
Adding cooling to the extruder helps--just a small amount of airflow on the motor/extruder help significantly, but reducing the chamber temp (and maybe keeping the door open and top panel off) will help with PLA.
Also be sure the hot-end fans are working. If these fail, no filament will feed.