Make it float challenge
How many coins ? My goal is for R100 in R2 coins that's enough to buy 2 Pizza's

Concept is a hexagon shaped platform with pylons like an oil rig, this was inspired by seeing the PetroSA rig in Mossel Bay, thought hey rigs are stable and carry a huge load.

To add to the use I decided to create the challenge into a money box for kids to save, maybe when you sink the ship you can get the treasure. Printing the pylons in transparent should provide some motivation to save.

I have tried to prepare the cad file so it can be used with the customizer, make sure you give enough clearance for your local coin size.

Problems: PLA does not make a water tight vessel I only had clear PLA so the pylons are printed in ABS. You will need to clean up the locks on the prints. Acetone can be used to weld the ABS and seal the pylons.
The video is https://youtu.be/1snhbqMHO7U

Print six pylons in transparent filament so you can see your treasure of coins. I suggest ABS and acetone polishing or ABS glue to make it 100% water tight.

Print the platform then slot and lock the pylons into the platform. Drop your coins through the slots.

If you want to use bigger or heavier coins you can adjust the difference between the two cylinders and add minimal infill, this provides more air pockets and better flotation.