Be very careful guys ..... I got a spark then a mild electrical shock, while trying to adjust an M5 bolt securing my Y carriage and hotbed to the aluminium frame of my HICTOP 3DP11...... the similarity is the power supply is mounted to the aluminium frame by four M3 bolts onto a metal back plate as described in this forum topic.
I am thankful I found this discussion online, thank you for posting up .
This potentially fatal manufacturing ERROR needs addressing and making public !!!!