See the new and improved internal wide version!
https://makerworld.com/en/models/514245#profileId-430409
A simple but well designed fidget slider (42mm x 16mm x 13mm). Slight contours to fit well in your hand. Uses 10 6x3mm magnets. 3MF file has the slider scaled to 104%. This gives the proper fit for the magnets when printing with PAHT-CF. You may need to scale accordingly for other materials.