If you experience chain slippage, look into @mrfugu’s solution. It is simple, elegant, and completely eliminates the chance of slipping by not allowing the chain to disengage the sprocket. One thing it does not do, however, is ensure that the chain is not twisted as it approaches the sprocket (which @Blsteinhauer88’s solution does, and there are other variations people have come up with that also ensure that the chain is on the same plane as the sprocket), however I found that by moving the bottom pulley (for the bungie) out in the z direction to where it is on the same plane as the sprocket, the chain stays parallel without the need for something to ride on.
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