Balsa Sanding bloc

Two sanding blocs I made in order to build balsa planes.
They work well and are easy to hold.
Since the shape is simple, it doesn't require any support.
This is my first post on thingiverse so I hope everything is clear enough

Sanding surfaces:

-Small block: 40mm x 60mm
-Big block: 60mm x 200mm

Be sur the have enough building height to print the big one(since it is 200mm long).