Improvements : 1) Improved SS body, Anti-fingerprints, more thickness with Polished corner. 2) High-quality solid rubber tensioning knob, wearproof. 3) High precision processed driven wheel and sealing belt easily replacing device. 4) More thickness and wider heating block & cooling block. 5) High precision processed driving wheel, much beautiful. 6) High-quality power switch, more safety, more care. 7) Improved polyformaldehyde conveyor roller and More thickness conveyor belt, much durable. 8) Unibody gear box, flank fixed, more steady. 9) High-quality polyformaldehyde gear with high- strength injection molding, running more smooth and low noise.