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I have the DE10 Nano so I can run the cores available on github under the MiSTer project. Since I'm waiting on the SDRAM addon and IO Board I wanted to still be able to run a fan to cool the Intel Cyclone V and other components. You can still run a decent amount of the cores without the SDRAM board.
The included stock clear plate is 2mm thick and to create new plates I used dimensions from the Terasic site for the length, width, and hole locations with diameters. Using a caliper I measured where the center of the Intel Cyclone, GPIO headers, and Arduino headers. Also I measured a 40mm fan since that is used with the IO board.
Files and description:
DE10_Center_Y_Axis_Both_IO- I recommend this one for the top plate. It has 40mm fan in line with the Intel Cyclone on the X axis but fan is centered on the Y axis of the entire board. Cut outs for both GPIO and Arduino headers. With this plate the SDRAM addon board does fit!
DE10_Fan_Over_CPU_IO_Cutout- Fan is centered directly over the Intel Cyclone but only 2 mounting screws as to not interfere with the Arduino header. Cutout for the other GPIO headers. Can not use the SDRAM addon with this plate.
DE10_Fan_Over_CPU_Solid- no cutouts for GPIO. Fan is centered directly over the Intel Cyclone but only 2 mounting screws as to not interfere with the Arduino header. Can not use the SDRAM addon with this plate.
DE10_Solid_Blank- I recommend this as a bottom plate. Its solid plate which can be used under the DE10 Nano as spot to place a USB hub for example. I would not use this plate on top since it could trap heat from the board. Can not use the SDRAM addon with this plate on top.
Video from SmokeMonster about it: https://www.youtube.com/watch?v=GID1ShPkK6k&t=2s