Good point on looking after the bar 046.
Who knows you might be able to save the chain, the more a chain is filed back often the faster it can cut. If you want to bring a chain back to life provided the rakers are not all filed away, once you have the angles and file size all worked out, go arround the chain and measure the lenght of the teeth caliper works best, find the shortest one and mark it with a marker, sharpen that tooth and measure it again, then go around the chain and bring all teeth back to the same length, recheck the raker heght with a gauge even them up to the proper height for your chain and saw and you have a good chain again.