Hello, My name is Soomin Kim, working on 3D printing business in Korea. I use various products such as E3D products and Prusa, and E3D TC is especially attractive. I just finished first drive test. I'm busy on weekdays, so I take time every weekend to try TC, and it's a very fun machine. I got help from posts from many Well-Known memebers such as'Greg, Nibbels, Peter Engel, Andy Cohen, mkudzia' and more. Thank you all the time!! I ran into some problems. I ask for your opinion because I think there is something I am missing. Here is my TC spec: 1.Two HEMERA-Direct 1.75-I have deployed on T1, T2. 2. Duet 2 Wifi + Duex5 / Firmware-3.1.1 (2020-05-19b2) / Server 1.23 3. Bundle HBP + Whambam PEX Magnet Flex sheet Here are the some questions! Error: M104 invalid tool number This message appears when selecting T2 during printing. I looked through the config file and S3D, but didn't find any problems. Tool selection was normal, only PCF was not driven. Error: over temperature shutdown reported by driver(s) 9 Sometimes this message appears, sometimes it doesn't. Could it be a problem with the wire connection? I tried printing the Dual Cali cube. (Attached some pics) Layer 0.15mm - T1, T2 used PLA The results are not satisfactory. It stacks well up to a certain height and looks fine. After a certain height, it looks like having problems with the Z-axis, I need your feedbacks. I think need to adjust the X/Y position a little more.