CorelDRAW X5 :: Small Graphics (logos) Have Saw Tooth Lines When Printed?

I am printing to a Brother laser printer and a Kodak inkjet using logos in a size I have never used before. None of the content is postscript, none of it should have halftone, and none of it is bitmap-based. I have resized simple CDR and AI vector line art logos for clothing care from large size (about 4") down to 0.25" for a project I am working on. Uniform fill in black is used and some of the logos have outlines and some do not. When I print the tiny logos on the laser printer, even with a DPI or 600 or 1200, some (not all) of the lines have a noticeable saw tooth appearance under magnification, instead of smooth. Fonts that are around 5-point print with clean lines. When I print on the inkjet printer with the same DPI settings, the logos appear smooth under magnification. There may be a hint of a saw tooth, but it is barely noticeable. Font that are around 5-point print with clean lines. Perhaps I went beyond the capabilities of the laser printer, but I question that because the fonts print cleanly with much finer lines than in the logos. Note that I did notice a 45 degree halftone appearance in laser printed text with a uniform fill that was much larger than the logos, even though it is not postscript. This did not occur with the inkjet.

how I can make these logos have crisp solid lines in the tiny size I am using? I'm not printing separations. I haven't found any settings in CorelDraw X5 to fix this.