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The Nutter Butter haptic slider was designed by me from the ground up using an actual Nutter Butter cookie for reference. The size, shape, and pattern is the same as a real Nutter Butter cookie. This slider uses teflon rails for smooth sliding, as well as 4mm ball bearings to limit motion and prevent accidental separation of the part, which are held together and made haptic with 8x1mm round magnets. There are four such magnets in each piece, including the filling, for a total of twelve magnets. If desired, the rails and balls can be removed to free up the motion for additional skill-play fidgeting. They can easily be replaced by hand as well. These are printed in PLA, and the magnets are trapped inside the printed parts. While the color shown may not be a perfect match to the real cookie, I think it's a nice fit. However, the color may change if a better match is found in the future.
The Nutter Butter Haptic Slider is $30 USD. Shipping is included for customers in the USA, but can be shipped internationally at additional cost.