The printer is not stable, Iqbal struggled for this problem for a long time. Finally, he found out that it is not stable due to the current. The thermal printer only can works stable on 2A current.
After the printer worked well, we found that the first version ticket on the left didn’t fit the paper, the text on the ticket is small and lack of direction. Then Iqbal and Yan modified the ticket. The final version looks like the one on the right.