Abstract: A plastic welder has a rod passage that extends between a rod insert that receives a plastic rod. One or more engagement wheels frictionally engage the plastic rod within the plastic welder. A user-operated handle rotates at least one of the one or more engagement wheels in a first direction to advance the plastic rod along the rod passage. A heated barrel heats the plastic rod to above a melting point of the plastic rod. The heated barrel has a nozzle. The drive mechanism advances the plastic rod such that molten plastic is extruded from the nozzle.

Abstract: A sliding engagement is described for a stacking delivery tray having a sliding surface that has a break. The sliding engagement includes at least one ramp on the sliding surface providing an inclined sliding transition to an end of an overlying tray sliding along the sliding surface in order to traverse the break in the sliding surface.

Abstract: A sliding engagement is described for a stacking delivery tray having a sliding surface that has a break. The sliding engagement includes at least one ramp on the sliding surface providing an inclined sliding transition to an end of an overlying tray sliding along the sliding surface in order to traverse the break in the sliding surface.