Summary

This is the so called Papp's mute or treble mute, that is used to mute the treble strings while tuning a piano.

I designed it so that it is printed into two different prints. One is the main body and the other is the tip. This way less supports are needed and also the tips have better strength and usability.

The files are given with the optimal orientation to be printed, especially for the tips since printing them this way makes them stronger, (layers are perpendicular to the force) more accurate, (the detail on the edge is important so that they fit between the strings but also not slide out on their own), and smoother so that they can slip easily between the strings.

Print Settings

Printer Brand:

Creality

                                            Printer:                      
Ender 3

Rafts:

                Filament:                                     Creality PLA                                        
                        Notes:                     For the main body:

0,2mm layers
20% infill (more makes assembly harder, less make it brittle for the application)
supports enabled

For the tips:

0,12mm layers (not critical)
100% infill
supports not needed

Post-Printing

For the assembly a toothpick (2mm diameter) is used as the shaft, CA glue for gluing the tips on the main body, and a spring with 6mm diameter, 5mm length compressed, and 15mm uncompressed.

First you can assemble the main body by flexing one part so that the other can pass through and then, by using some tape between the two halves (to avoid gluing them together) you can glue the tips on one at a time, so that you can align them easily.

The spring I used comes from an inject printer, but you can use any spring and glue it on the edges if it does not stay in place.

You may need to file the two overhangs on the main body in order for it to close completely, especially if you use less dense supports.