Due to the feedback of the last version of the installation is not stable, this update was made.

The backplane and iron bracket of the four screw holes I repeatedly measured, but the print will always have errors, resulting in the installation of the screws will be tight (there may also be a hot fusion nuts installed crooked).
So upload the backplane STP file, if the error is too large you can modify their own.

This version does not need to use glue to fix, directly use the screws to fix, easy to replace.
This version reserved for the installation of LED position, but has not yet designed, so this version is no LED (personally do not feel the need), please note!!!!!

About the duct and platform friction problems, as shown in the design, the lowest point of the nozzle and the duct is a certain distance, if the duct and the platform cut, you can extend the pipe some (some pipes will be 1-2mm short), so that the nozzle tightening will become longer.

5015 turbo fan needs to be trimmed to fit, due to too busy, 4020 turbo fan has not been adapted.

I used PETG to print all, the duct part of the layer height of 0.15mm. PETG in the case of not sealed to provide sufficient strength, but after sealing the box may be high temperature softening.

BOM:

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2023-02-21  update

Added a backing bracket to install COB LED
I didn't print a file to verify this stand. I couldn't find a suitable size LED on Amazon and eBay. Please try using Taobao to find the parts you need, or provide me with the dimensions of the parts you find. I modify the file to fit the LED you can find.
Some parameters of COB LED
Dimensions: 40X7mm
Voltage: 5V