Square Hygrometer Spool Inserts

Simple filament spool inserts that can hold the cheap square hygrometers found on Amazon, AliExpress etc. I found some existing designs that weren't good fits for the spools I own, but they did inspire the design, which is simple enough that even I could figure out how to hack it together in Microsoft 3D Builder. Also added the 3mf template I made for quickly creating various sizes. Designs that inspired this one:Hygrometer Mount for Filament Spool by Engineered RealityHygrometer Spool Mount - 50mm Diameter by CrooksUSAspool thermometer and hygrometer mount for filament storage by Laurenz