I image using a similar jig, but with wider tubing and possibly mixing the straw in as clay mixture is being poured out. But how would keep the cob mixture cons

I image using a similar jig, but with wider tubing and possibly mixing the straw in as clay mixture is being poured out. But how would keep the cob mixture consistent? Pre separated components, like the sand, clay, straw? Depending on how wet you apply it, you might need to take timeouts for layers to dry.