Thingiverse
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30mmfan 3D Printable Models
Raspberry Pi 3 (B/B+) Easy Access GPIO Case
Printables
omfartal
30x30mm fan covers
Printables
Kosmo Creations
Voron 0 /0.1 Mini Afterburner mod of the Revo Voron hotend to use a 30x30x10 Fan.
Printables
ProwlerON
XRay XB4 Fan Mount
MakerWorld
DynaMight
Mantis XOL 2 - for TAP & Bambu Lab hotend with 30mm fan
MakerWorld
PrintStructor