raspberry pi 3b+ case 40mm fan
thingiverse
40mm fan used: https://www.amazon.com/GeeekPi-Raspberry-Controllable-Adjustment-40x40x10mm/dp/B092YXQMX5/ref=sr_1_3?crid=CQ3CGRKYO986&keywords=40mm+fan+for+raspberry+pi&qid=1650172741&sprefix=40mm+fan+for+ras%2Caps%2C72&sr=8-3
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