Are you asking about Ultimakers specifically? Or any printer with Marlin? Because if you are then you can tweak the movement settings - specifically XY Acceleration and XY Jerk. If you increase these paramters your printer will print faster at sharp corners.
But Ultimaker uses stepper motors (not servo) so there is NO FEEDBACK if a step is missed. Once you start missing steps the part comes out pretty bad (each layer horizontally shifted in a bad way). So you have to play with these settings until you start losing steps and then back off a bit. It helps to put lots of oil on the rods and keep the belts loose (tight but not very tight). Loose belts are easier. It also helps to increase the current to the steppers (there is a tiny potentiometer on the stepper drivers to control this) but you can damage the steppers if they get too much current so this is only if you are very comfortable with lots of careful testing and reading of the specifications for how hot the motors can get and how much current they can handle.
Recommended Posts
illuminarti 18
it seems like this is something that needs to be taken care of in the modeling process, perhaps with the addition of smart acceleration management in the firmware, as Marlin has to carry as much velocity through corners as possible, but in a controlled way, so as to avoid print artifacts.
Arbitrarily rounding corners in the firmware/slicing process seems like a recipe for disaster if you're expecting to be able to design printed parts that can interact predictably. I can see reducing the resolution of movement, and layer height in order to allow for faster printing but whatever tradeoffs are made, it needs to be totally predictable, the actual positional accuracy of the system needs to be maintained within that resolution, else you just end up with a mess where layers don't line up and you get problems with overhangs etc.
Furthermore, bear in mind that the practical speed limits of deposition printers are more to do with the extruded material characteristics than the printer mechanics. Most high-end 3D printers can reliably deposit plastic faster than will actually create a usable print - you have to slow them down to allow time for the layers to cool and harden sufficiently.
Link to post
Share on other sites