IKEA Lack Extractor Fan Assembly

This is my first CAD design, ever. This is an extractor fan assembly designed to be used on an IKEA Lack enclosure setup. The aim was to have an extractor fan (or two) mounted on top of the enclosure to extract heat (for PLA) and fumes (for ABS) from the enclosure when required.

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###Updates

Update (2018/04/05): I printed out the bottom part of the fan assembly (IKEA_Lack_Extractor_Fan_Assembly_Bottom.stl) and noticed that there was a small 1mm gap between between the inner wall and one side of the fan mount. I've corrected this and uploaded the fixed STL file.

Update (2018/04/05): I printed the top half of the assembly (IKEA_Lack_Extractor_Fan_Assembly_TOP.stl) and found another error I made in the design. Whilst making the slot system so that both halves slot into one another, I forgot that this would take the height (excluding the flared ends) from 50mm to 48m