Models
Spacers 3D Printable Models. Makeshape.co have 3 Spacers 3D Printable Models.
Bookbinding Tools
Makerworld
Zoteosophos
Free
DIY Spacer Packers – 1mm – 6mm
Makerworld
Redwings
Free
Decking board spacers 5mm, 6mm, 7mm, 8mm
Makerworld
Pojebaczi
Free