Relocating the AP (Host MCU) Board to the Back of the Qidi Q2
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Mounting plate to help relocating the AP (Host MCU) Board to the back of the Qidi Q2, in order to reduce system crash.
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Qidi Q2 puts its AP (Host MCU) Board on the left side panel in the chamber. This leads to the chances of the system crash(unexpected shutdown) due to the high temperature of the chamber. General speaking, comsumer grade MCUs have -40°C ~ 85°C working temperature range. Although the chamber temperature of Q2 is 65°C in MAX. The host board doesn't come with fan cooling and it's located right on top of the chamber heater, plus its own working heat generation. The actual MCU temperature while printing, especially when print at 65°C chamber temp, is going to be very close to its 85°C working limit which causes the MCU running in an unstable situation.
In fact, there are feedbacks from the community that Q2 users do experiencing unexpected system crash during high chamber temp printing, or even sometime crashes during the chamber heating up process. And this could be one of the reasons.
If you have ever encountered this type of problem. You might need to consider this upgration.
The following screenshot shows the Host temperature exceeded 85°C while I was printing an ABS model.
FYI, if you were wondering how to monitor Q2's Host MCU Temperature at the web console. You can simply insert the following macro code in your printer.cfg file, then restart, you'll see the Host temperature showing in the Thermals section.
[temperature_sensor host]
sensor_type: temperature_host
min_temp: -20
max_temp: 100
The idea is to find a place to relocate the AP (Host MCU) Board. Fortunately, I was able to relocate the board to the back of the machine without any structure changes with this design.
The following screenshot shows the Host MCU at a reasonable temperature while I was printing an ABS model after I had applied the relocation.
BOM
Parts are needed except the mounting plate model. The original Self_Tapping flat tip screws can be reused to mount the board on the plate.
Installation Diagrams
The Host MCU Board will be reloacted to this L shape bar.
The mounting plate will use these places to secure itself.
Unscrew this original screw first.
Clip the PartB in the position.
Rescrew the original screw in.
Take the plate PartA and put it together with the Host MCU Board.
Align them with the installed PartB.
Mount screws.
The board mounting completed.
Use the extending connector to extend the on machine's screen cable with FPC flexible flat cable.
Cable Spec. : 0.5mm pitch, 50pin, L=600mm, same direction contacts
Run the FPC cable toward the back of the machine, folder it up at the corner, go through the hole where the original cables were running.
Connect the FPC cable with Host MCU Board.
Here is how I've managed the cables for your reference.
Video Instruction
http://www.bilibili.com/video/BV1oBdkBQEr7?pop_share=1&spm_id_from=333.40164.0.0