extrusion apparatus 10 is in operation the material to be extruded drops under the force of gravity from the hopper compartment 34 into the compacting chamber 38 to be compacted the interchangeable extrusion mold 16 is secured to the support structure 28 adjacent the extrusion end of the compacting chamber 38 the support structure 28 comprises bracing wings 29 and an anchoring bar 31 the bracing wings 29 extend outwardly from the hopper 14 and are held in spaced relationship by the anchoring bar 31 the anchoring bar 31 is the support from which the extrusion mold 16 is suspended each extrusion mold 16 has a different cross sectional configuration so as to shape the material extruded into different shapes see for example the different extrusion mold 16 shapes illustrated in fig5 and 7 each interchangeable extrusion mold 16 is adapted to be received by the support structure 28 and has an attachment plate or flange 40 which can be securely attached to the hopper 14 see fig2 this attachment can be accomplished by any suitable means however it is preferred that the attachment be by nut and bolt assembly as illustrated in fig5 and 6 bolts or bolt stubs 42 are affixed to the lower external portion of the hopper 14 so that they.