I want to have a 3D printing service like https://forgelabs.com/ or https://www.makelab.com/ print a pair of these horns
https://at-horns.eu/A460D.html using this STL file kit. https://cults3d.com/en/3d-model/various/ath-a460d-stl-kit
Those shops with large scale SLA machines can likely print the entire horn in one pass, avoiding the need to print out petals and glue petal sections together.
While SLA machines can print out horns produce horns with highly accurate geometries, they would also need to utlize a resin with acoustic inertness at least approaching that of these lower density polyurethane boards. https://www.freemansupply.com/products/machinable-media/urethane-foam-boards
In fact, I was originally going to make the horns by CNC milling this board. https://www.freemansupply.com/produ...-styling-boards/freeman-m-3400-modeling-board But sanding the inside of the horn to eliminate any tooling marks, that could have caused HOMs or other resonance, looked to be too problematic.
And the resin must also result in a highly smooth surface inside and round the mouth of the horn.
Which resins can best meet both requirements?
But what are the tradeoffs?
Has anyone known use of Accura AMX Rigid Black?
prototek.com
For an audio horn it would apparently offer both strength, high rigidity and an exceptionally smooth non-porous surface.
https://at-horns.eu/A460D.html using this STL file kit. https://cults3d.com/en/3d-model/various/ath-a460d-stl-kit
Those shops with large scale SLA machines can likely print the entire horn in one pass, avoiding the need to print out petals and glue petal sections together.
While SLA machines can print out horns produce horns with highly accurate geometries, they would also need to utlize a resin with acoustic inertness at least approaching that of these lower density polyurethane boards. https://www.freemansupply.com/products/machinable-media/urethane-foam-boards
In fact, I was originally going to make the horns by CNC milling this board. https://www.freemansupply.com/produ...-styling-boards/freeman-m-3400-modeling-board But sanding the inside of the horn to eliminate any tooling marks, that could have caused HOMs or other resonance, looked to be too problematic.
And the resin must also result in a highly smooth surface inside and round the mouth of the horn.
Which resins can best meet both requirements?
But what are the tradeoffs?
Has anyone known use of Accura AMX Rigid Black?
Accura® AMX Rigid Black for SLA
Accura® AMX Rigid Black is a production-grade resin for stereolithography with demanding mechanical performance and environmental stability.
prototek.com
For an audio horn it would apparently offer both strength, high rigidity and an exceptionally smooth non-porous surface.
