i was trying to copy my friends marshmellow gun and during the process i realised that a paintball fit perfectly through 3/4 inch pvc pipe!
of course i tested it and it worked.
Step 1: meterials
you will need 2, 90 or 45 degree connectors,2, 3 way connectors, and 1 or 2 long peices of pvc pipe, duct tape.
*make sure that the pvc pice is 3/4 inch*