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Summary First design of a spring loaded guide tube to absorb the shock of pulling from a 5lb spool Instructions Printed 200micron 25% fill 2 shells with raft and supports. Used the spring left over from the print head upgrade http://www.thingiverse.com/thing:42250 When printing using a fresh 5lb spool I noticed that the was a bit of a jerk each time the printer would restart the feed. This is an attempt to diminished that stress.