Bingo Style Lottery Machine

The model consists of quite a number of printed parts. I hope you will enjoy the assembly process! Steps to assemble the model are described in detail below and also demonstrated on attached picture.

List of Parts to Be Printed

• 2 Stands

• 1 Shaft

• 1 Side Disc with a Tip

• 1 Side Disc without a Tip

• 1 Crank

• 1 Handle

• 1 Drum

• 4 Connecting Pins

• 1 Front Lid

• 1 Top Lid (optional)

• 2 Mixing Pins (at least two, but you can use more)

• 1 Output Bin

• 1 Slide

• Dice / Balls

I recommend printing Shaft and Crank using PETG so that they are not brittle. The rest can be printed in PLA. I used black PLA and Prusa Orange PETG. Attached pictures demonstrate recommended printing orientation for each part. 

I recommend using supports when printing Shaft, Drum, Top Lid and Slide. When printing Drum make sure that there is no support inside the holes for Connecting Pins though. 

Bill of Materials

• Two 608 bearings

• Empty Prusament spool

Assembly Instructions

All parts are supposed to fit tightly together, glue is not needed. Especially Connecting Pins and Mixing Pins are supposed to fit very tightly. If this is not the case for you due to material shrinking, then you may slightly scale the pins up or down, or use the glue afterall.

Most of the assembly process can be done on a flat surface by stacking parts onto each other one by one. Steps:

1. Install 608 bearings into each of the Stands and then place one Stand flat on the table with a bearing facing up. Both Stands are identical, so it does not matter which one you start with.

2. Insert Shaft into the bearing, use the "shorter" end of the Shaft. The end of the Shaft goes through the bearing and should become nicely flush with the bottom of the Stand.

3. Take one of the Side Discs and install it on the Shaft, flat surface of the Disc facing down. Push the Disc all the way down the Shaft.

   1. Two Side Discs are included, but they are not the same. One Side Disc has a small tip - a bump pointing out, and second Side Disc does not have this tip. It does not really matter which of the Side Discs we use at this step. For simplicity of these instructions let's use the Side Disc with a tip now.

   2. The Stand has three small bumps around the bearing. The bumps prevent the Side Disc touching the bearing, so do not worry and push the Side Disc all the way down the shaft. 

4. Take two Connecting Pins and install them into the holes in the Stand.

   1. These Connecting Pins are a standalone part so that they can be printed horizontally. They could have been part of the Stand as a single component, but then they would have to be printed vertically and that would make them too brittle.

5. Install Mixing Pins inside an empty Prusament Spool. You may use multiple pins, and also you may use pins of different lengths if needed - depending on the size of the balls / dice used and also their amount. I only used two 4cm Mixing Pins, one on each side of the Spool and it is functioning very well.

6. Take the Prusament Spool and install it on the shaft. Note, that there is a small groove on the inner side of the Spool. Make sure that the tip of the Side Disc fits into the groove on the Spool.

7. Take the second Side Disc and install it on Shaft on top of the Spool.

8. Place Drum on top of the Stand, make sure that the two Connecting Pins previously installed into the Stand fit right into the base of the Drum.

9. Take the remaining two Connecting Pins and install them into the holes in the base of the Drum.

10. Install the second Stand onto the Shaft, again make sure that the two Connecting Pins previously installed into base of the Drum fit right into the holes of the Stand.

11. Install Handle on the Crank. 

    1. Handle could have been designed together with Crank as a single part, but I prefer it standalone so that we can use two contrasting colors for each part.

12. Install Crank on the Shaft. Now the whole length of the Shaft is fully occupied. 

    1. By design there is a one milimeter space between the Crank and the Stand. This way the Crank does not bump into the Stand when rotating the Crank.

The main assembly is complete! The rest is optional - use Front Lid whenever you want to mix the dice / balls so that they do not get out of the Drum. Use Top Lid to close the entry. Use Slide and Output Bin to catch the balls jumping out of the Drum. 

The model also comes with 26 dice numbered from 00 to 25 (see a zip file in Other Files section). If you need more dice, you can print the same numbers in more colors so that you have Blue 01, Orange 01 etc.  just like in the Bingo game. In such case you might also want to scale them down a bit and print them smaller so that they all fit inside the spool. To get an idea on the volume needed, the Output Bin on the picture contains all 26 dice.