Alto trombone
thingiverse
an alto trombone to print you can print it in 3 parts if your printer is big enought. otherwise the main 3 parts can be printeted and assembled individualy, you need to print every parts 1 time except the innerslide an outerslide connector that should be printed 4 times each. a little demo : http://imgur.com/a/gtQBnPf
Download Model from thingiverse
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