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.
Finished hunting arrows should be at least 3/4 longer than your draw length to provide clearance for your broadhead. A little extra length doesn't hurt anything at hunting ranges and can help in the tuning process later. If the bow is marked 50#@28 and you draw 26, your arrow is not going to see 50 pounds of force. Most bows will increase or decrease about 3 pounds per inch above or below the weight/length it is marked. Now, just because it is marked 50#@28 doesn't mean it is! I have seen them mis-marked by 7 pounds or more plus, if you are drawing the bow into the region of the draw force curve where it is stacking, the draw weight can vary more than 3 pounds per inch. If in doubt, you need to get your bow weighed on an accurate scale at your draw length.