To complete, you will need a two tubes (preferably aluminum) with an outer diameter of 10 mm. Rolling axis tube should be 128 mm long. 

Chamfer the edges of the tubes for easier installation.

Glue may be needed for attachment of tubes.

The body of the cylinder consists of two parts. The body itself and the bottom of the filling hole. Use the Roller.step file to slice. Set the fill to 10% for both parts. For the bottom of the filling hole, set the top and bottom solid layers to and the perimeters to 0.

You can fill the cylinder with fine dry sand or water. If you use water, you will need to seal the cylinder plug with a suitable adhesive. I recommend using sand.

Recommended material PETG.

Use brim to print handle.