Vectorized image will give you a crisp Line always. As you are Screen Printing, when you output your films if you have 100% of each CMYK or just only 100% of the black which is enough depending upon which printer you’re using to print, there should be no bitmap on the edges or on the lines. By you converting this for some reason into a PNG or JPEG more in Photoshop, and if you try to enlarge it depending on the resolution that you created it on Photoshop or saved it in Photoshop will result into a bitmap image so that’s when you see the jagged edges. I suggest to print directly from illustrator if possible or PDF from illustrator if possible maintaining vectorized images so you can increase it to thousand percent and it will be perfect it will never be jagged. That will solve the problem no and if or butI originally printed from Illustrator. Artwork is CMYK with C=0,M=0,Y=0,K=100.
I believe I have all the print options cranked to max quality however if I look super closely at my film positive, curves are not smooth. From a normal viewing distance my film print looks awesome but the effect seems to be magnified by the time I expose a screen and then use ink. I output a 1600dpi PNG from Illustrator and printed from Photoshop. That actually improved the edges however I can still detect some saw tooth effect. I've exposed enough screens to know it's still too jagged for a nice print with ink. I'd take a photo with my phone however It won't be high res enough to make out what I'm referring to.
Anyone using this printer able to help me out? Thanks!