If you are looking for a way to relieve stress, improve your focus, or just have some fun, Roller Rapture is the perfect fidget toy for you.

This model is inspired by popular fidget roller devices that promote stress relief and concentration. It consists of two rollers supported by bearings that move in a circular motion in your hand with minimal friction and noise.

You can play with it in one hand or both, or even with your foot and roll it in different orientations. You can also customize it by printing it in different colors or materials, such as TPU for a softer feel.

I designed this to be easy to print and assemble, and comes with a high resolution 3MF and STEP files with different size options. This fidget toy is suitable for anyone who needs a discreet and satisfying way to fidget.

Shown is an Overture high-speed TPU (rollers) + Red Prusament Carmine PETG combination that looks really neat. Also shown in in photos: Sunlu White PLA+ (large) and Prusament Galaxy Silver PLA (small).

Options

• Comes in a Small and Large size, for smaller and bigger hands.
• Also comes in a countersunk screw or “cap head” screw type for each size (4 total options) to accommodate whatever you might have on hand. My assembly instructions below show the more common cap-head screw type.

Required things

• 4x 605 ball bearings , such as these 605ZZ ones: https://www.amazon.com/dp/B07FDTC4BX . Ball bearings give the best smooth silent operation. You could also try to 3D print and lubricate some 605 bearings like this one instead: https://www.thingiverse.com/thing:2516471.
• 4x M5 Screws.
  • I provide options for countersunk and cap/button head hex screws depending on the look you want. Any length between ~M5x12mm to M5x30mm should work.

Filament Choice

• PLA or PETG works great here.
• In one of my examples here I used Overture's high-speed TPU (relatively hard) with a high wall count (3-4) for a different feel, and this also works well. Soft TPU at low wall count might not work great.

Print settings

• No supports needed, print as shown.
• 0.2 mm height works fine.

Assembly

Overall assembly cross section for each roller shown here for reference:

Metal Bearings in yellow, 1 screw shown in teal, connectors in blue, internal rods and rollers in pink, thin printed bearing spacers shown also in yellow/green.

Instructions

1. Use a hex wrench and a screw to cut threads (tap) for each end of the internal connecting rods (4x taps in total). Remove the screw(s) after using them to cut the threads. In this picture, M5x16mm screw shown inserting into the internal rod:
2. Assemble the screw + connector + bearing spacer (thin printed washers) + bearing+ internal rod stackup as shown here. The screw should fit snugly in the threads you tapped but don't overtighten/strip the internal rod:
3. Insert the roller over the rod onto the bearing. Then insert the bearing on the other side. It should look like this:
4. Put the spacer on the other side, and screw in the other screw through the second connector piece. Note that you may need to hold the first screw in place to do this (1 wrench/driver on each side). Now it should look like this:
5. Repeat steps 1-4 for the other side. You're done! Tension the screws to get the feel you like. If you overtighten you may notice that the motion becomes unsmooth.

Other tips:

• It helps if you wash out most of the thick grease that comes in the bearings with WD40, and optionally replace it with a thin oil.. this will lead to the smoothest handfeel. However, this is totally optional. It will be smooth and quiet without this.

Enjoy!