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Found eight block intent 3d models.

free
thingiverse
SmartRap modified Base Plate variations
free
grabcad
Shapeoko 2 CNC Router with Enclosure
free
grabcad
MAZZOCCHIO in Codex Atlanticus
free
grabcad
Plumber Block Assembly
free
grabcad
SHT MTL MOLD ASM.zip
free
grabcad
Engine Block
free
grabcad
Classic Escapement - Graham (Ideal)
free
3dwarehouse
The Torque Gauntlet