Can't shuffle? Never seem to be able to find batteries for your electric shuffler? No need to worry we've go you sorted with this fully 3d printable hand crank card shuffler.

Included is 18 part models that all fit or screw together to make the full assembled model. For assembly you will need one of each part except for needing 2x "Card Shuffler - Nuts" and 6x "Roller Ring - 26x18x4 Ring". To make the model fully 3D printable I've included a roller ring model (26x18x4mm Size). However unless you can find a very rubbery TPU or other printing material I'd recommend just using a couple 26x18x4mm rubber O-rings. One thing you will need to have is some sort of lubricant for all the drive parts in the Gearbox. I used a silicone lubricating grease because thats what I had. I attached a picture of the tube. It will work without lubrication but not nearly as smoothly. Lubricate every moving part generously.

Print instructions:

• Base, Back (Gearbox), and Gearbox cover can be printed with lower infills (15-20%).
• The Card Press should be printed at or near 100% infill because the weight of this piece can help press down the cards with added hand pressure.
• All remaining parts are essentially drive parts or securing parts and should be printed at around 50-60% infill for strength
• 0.2mm layer height for everything
• Shouldn't need any supports with correct orientation of parts

Assembly instructions:

1. First install O-rings or roller rings onto Left and right rollers
2. Lubricate and fit rollers into the base part with the pin side sticking through the holes on the front. (Make sure the left and right rollers are on the correct sides. Directions are referenced from looking at the front of the model.)
3. Fit the back(gearbox) piece into place making sure all the pins and rollers line up.
4. Lubricate and install the Left and Right Spur gears with their associated rollers by screwing them in. The screws are threaded differently (anti clockwise for Left and clockwide for right) if you install them backwards they may loosen during use and cause the shuffle to not work.
5. Lubricate and install the Spur Gear (25 teeth) on the small peg under the right roller gear. as well as install the Spur Gear (25 teeth) Nut. This nut is anti clockwise to prevent it loosening by gear movement so turn it left to tighten.
6. Thread the large Spur gear (112 teeth) onto the Centre drive shaft then Lubricate and fit the small peg into the middle of the gearbox.
7. Install the gear box cover by fitting it over the 2 threaded posts and Centre Drive shaft. and secure it with the 2x Nuts you printed.
8. Fit the Handle Bolt through the Handle and thread it onto the Drive wheel.
9. Thread the drive wheel with the recently attached handle/handlebolt into the center drive shaft.
10. Place the card tray in the slot, some card in the machine, and the card press ontop and start shuffling!

Any issues you have let me know!

Update September 12, 2025 Based on a comment recieved I've revised the design of the gears/drive system for better performance. The parts I revised should work with all other parts thus you should only have to reprint the 5 parts I made changes to which are as follows:

• Center Drive Shaft
• Left Spur Gear (25 teeth)
• Right Spur Gear (25 teeth)
• Spur Gear (25 teeth)
• Spur Gear (112 teeth), when printing this new verison pay attention to which side is up and down. one side of this gear has a recess which I used to dial in where it tightens on the center drive shaft. As long as that recess faces up there should be no supports needed.

Update February 10, 2026 Based on a comment recieved I've included a second gearing option for the gear drive. The sizing of the gears should decrease the force required to turn the drive gear however, this will come at the cost of shuffling speed. The following parts should be replaced with the originals to change out the gear drive:

• Card Shuffler - Back(gearbox) (rev2).stl
• Card Shuffler - Left Spur gear (25 teeth) (rev2).stl
• Card Shuffler - Right Spur gear (25 teeth) (rev2).stl
• Card Shuffler - Spur gear (25 teeth) (rev2).stl

The "(rev2)" indicates the updated gear drive parts. Original parts are still available under the regular parts without the "(rev2)" tag at the end of the filename. Let me know if you prefer the original or new gearing drive in the comments!