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.
Cams of a compound bow are round to oval metal discs which are held in place to the limbs via a pin and they are where the string and cable(s) terminate. They are attached at the end of the limbs and transfer the power of the limbs to the string and arrow during the shot.