I got a big fiber barrel and made what I think is a pretty decent one after my first attempt collapsed a plastic trash can...
Here is the bucket with the top just sitting on it:
Here is the top:
Here it is with hoses hooked up about to test. That pile of saw dust is about 2' x 3' and...
Elbow was moved to the 2nd position (middle). A 17-1/4'' 2x4 was passed through the planer 6 times, at 1/64'' depth. Performance appeared to be a little better about 5+ cups of sawdust was collected.
The elbow was moved to the 1st (original) position. A 17-1/4'' 2x4 was passed through the planer 6 times, at 1/64'' depth. Performance improved - about 5 cups of sawdust was collected.
The elbow was positioned in the 3rd position, close to the side of the trashcan. A 17-1/4'' 2x4 was passed through the planer 6 times, at 1/64'' depth of cup. A little over 4 cups of sawdust was collected.
The elbow was positioned in the 3rd position, close to the side of the trashcan. A 17-1/4'' 2x4 was passed through the planer 3 times, at 1/32'' depth of cup. A little over 4 cups of sawdust was collected.
The first test was to empty the box under my table saw. I expected more sawdust in the can; this appears to be less than half the quantity removed. Note the pieces of blue masking tape.
Note orientation with respect to 1'' dowel. Temporary piece of white Formica in lid grove simulates side of trashcan. The objective is to find optimum location.