Ditto to all above. I would add if you are using slicr go to printer settings and tweak the Z-Offset a business card is approx .33mm so without going over this amount, be careful, I have no way of knowing your actual settings so err on the side of caution! I would start with (-.15) to (-.25)mm get a calibration stl I use a 20X20X10 mm box and keep adjusting the z offset till you get consistent results. goog luck