The best-known non-impact printers are the inkjet printer, of which several makes of low-cost color printers are an example, and the laser printer. The inkjet sprays ink from an ink cartridge at very close range to the paper as it rolls by.
Here is an easy way to find your draw length, simply stand upright with your hands stretched out (hold naturally, do not hyperextend) and measure your arm span from fingertip to fingertip. Take this measurement in inches and divide by 2.5. This will give a good working draw length for your bow.
The best bow length for you will be roughly relative to your height and draw. Should you be quite tall, or have particularly long arms, and as a consequence your draw length is close to 30 inches, or even more, then a 70-inch model should be your option.