An adapter for a filament spool with large inner hole.
DMS DP2 (cheap chinese printer)
0.19mm layer height
0.3mm first layer height
40mm/s print speed
Made with Sketchup Make 2017
Measured dimensions with a ruler (kind of rule of thumb).
Started with a cylinder and then cut a central hole. Expanded parts for a stop (base and top), cut out holes with a star sheets to create slightly deformable towers, that will secure firm adapter installation without a fear of adapter slipping off the spool.
Modelling took around 15+ minutes.