FreeOctoPi Case for Prusa i3 MK2S and MK3 with exposed GPIO ports
Thingiverse
14 model
Free
FreeOpenBeam Exposed Bearing Flange
Thingiverse
FreeUpgraded fan duct (exposed print head setup) for Anycubic Kobra Go
Thingiverse
FreeEnder 3 Raspberry Pi 3 B+ case w/camera and GPIO exposed
Thingiverse
FreeBengine with exposed shaft
Thingiverse
FreeBiQu H2 Fan duct (With manual filament gear exposed)
Thingiverse
FreePrusa MK3 M2.5 raspberry Pi case with berry logos, exposed GPIO ports+Camera Slot
Thingiverse
FreeHW-408 Amplifier ventilation case with exposed outputs and potenciometers
Printables
Free3D Simo kit cover for exposed circuit board and display.
Thingiverse
FreePiCase for Ender 3 Remix - Camera cable hole - GPIO header partly exposed - room for cooling element
Thingiverse
Freesimple diamond
Printables
FreeGravity gear clock
Printables
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FreeBasketball ball stand
Cults3D
FreeTorture test for your 3D printer, will expose many issues- less then 3 grams!
Thingiverse