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.
Advanced Draw Length Suggestion. To find your ultimate draw length, get your hands on a bow with a cam or cams that allow you to change. the draw length in 1/4 to 1/2 inch increments. Shoot multiple 300 rounds (or record your accuracy by your own method) and study how you performed at the different draw lengths.