Hey all,
I’m just getting started with this printer and I’ve set out to do some initial checks and calibrations. I printed a couple 20MM cubes. The measured values in each axis are slightly off: within +/- 0.2MM in each axis.
How do I compensate for these values and improve my printing tolerances? I don’t see a relevant section in the touchscreen interface.
You can change the stepper motor rotation offset in the “Printer.cfg” config file, but I recommend NOT doing it this way.
Instead settings for machine basic profile and expected filament contraction with temperature will be in the slicer you used to turn the 3d model into Gcode, rather than on the machine itself. Without knowing what slicer you use I can’t really give specific advice, but on Ocra its under these two menus.
Shrinkage, flow ratio, motion adjustment are three separate things that need three separate tests, just changing one to get the outside width of a 20mm cube correct will result in problems with other shapes or sizes.
I’m using SovolSlicer, based on Orca.
I thought it would be a printer setting having seen some tutorials for other brands of printers. It makes sense to create a profile in the slicer.
Also pay careful attention to flow rate.
With perfect flow rate each outer layer line will be a tiny bit inside the ideal surface at the top/bottom of that layer, In the middle the filament will bulge a tiny bit OUTSIDE the ideal surface.
Over extrude and the bulge will be bigger, causing parts to measure larger outside to outside AND holes to get smaller.
Lots of people over extrude because the top “looks” better and don’t realize why their screws won’t fit in the holes.
