The one in the picture is an older version.

-Backplate thickness corrected
-Adjustments made to the hang hole.
-Upper "jaw" aesthetics corrected to fit the rest of the design (chamfered the top edge)
-Cable pass widened behind the cylindrical part

If used for other purposes, here are some numbers to see if it fits:

The thermometer dimensions
Height 54 mm
Width 14 mm (Thickness of the device)
Length 64 mm (This dimension has little to no relevance on the design)
The diameter of the cylindrical part is Ø 15 mm

The holder is 20 mm wide

Print time: 27 minutes
Filament used: 3.51 meters of PLA

Estimated material cost (PLA): ~0,32 €
(Calculated from 200 m spool with a price of 17,99 € ≈ 0.08995 / m)

FlashForge

Finder

Yes

No

Low

Although the model lies flat on its back, I printed this on its side to minimize supports.