Cement Mixer Drum
thingiverse
A choice between two concrete/cement mixer drums. Both drums have approximately the same dimensions but one has had a neck added at the open end which in theory would make it easier to support under load. Both drums have a 6mm dia hole in the closed and which is reinforced by an internal spinner and both drums feature a pair of spiral flights for mixing/extraction purposes. The one in the photo was printed half scale (200mm in length) for mounting on a small r/c truck, and the full scale drum should be capable of actually mixing a couple of shovel-fulls of sand/cement/aggregate. Scale freely... the only thing that changes significantly is the diameter of whatever piece of bar you glue in for attachment to a drive motor.
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