tin can phone with advanced membrane reusing spool
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The tin can phone can be used to exchange with each other by a taut/tense cord.
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Updated at source:
Model information
- Source
- Printables
- Category
- Other Toys & Games
- License
- Creative Commons — Attribution — Noncommercial — NoDerivatives
The tin can phone can be used to exchange with each other by a taut/tense cord. The membrane is printed with a large surface, so compared to a classic tin can, the sensitivity could be slightly higher.
The attached photos giving an example - by the way not with tense cord, so in this case you can't heat anything on the other side! Keep the cord tense!

Update 1st April 2025:
I had added also an ethernet layer I variant which is also able to communicate via CAT.5 cable if also kept tense. No joke: Really works! Compared to the classic variant, the ethernet cable do not use the cord but a RJ45 cable. You can safe two M4 nuts and the cord.
Building Instructions

You need:
- 2x printed tin-can-phone-membrane (1 print-plate)
- 2x empty cardboard spool from Bambulab filament
- 8x M4x8mm screw
- 8x M4 washers
- 10x M4 nut
- cord
- drill 4,5mm
The following steps are required two times. Both parts are connected by the cord together. It should be possible to reach distances up to 20 meters.
1 Step: Push the cardboard spool into the printed membrane

Step 2: Drill 4 holes with a 4,5mm drill

Step 3: Add the M4x8mm screw with washer attached (must be done 4 times)

Step 4: Add nut from the other side and screw tight (must be done 4 times)

Step 5: Tie one nut to the cord, so the cord can't slip out

Done: You can now start your phone call!
