It might also be possible to use ordinary LED light guides. A thin tube, 
metal or plastic, where you just drill holes for short LED light guides 
will probably work too.

Tektronix, and other instrument makers, used light guides for NE2 Neon 
indicators with either short light guides (sometimes without too) and in 
some cases long twisting light guides for indication on the front panel.

/Martin

On Thursday, 26 May 2022 at 21:04:52 UTC+2 [email protected] wrote:

> You can't really use a filament printer for something like this.  In order 
> to obtain the right optical properties and hold mechanical tolerances, a UV 
> cured resin printer must be used.  Because of my work I have access to 
> several dozen different printers.  In the end I chose a Formlabs printer 
> using  this resin:
>
> [image: Formlabs General Purpose 3D Printing Materials.png] 
>
> Alternatively, one could use a 3D print service bureau such as Protolabs 
> here in the U.S.
>
>
> On Thursday, May 26, 2022 at 1:07:03 PM UTC-5 gregebert wrote:
>
>> What kind of material is it ? I've only used PLA, trouble-free for many 
>> years now, because others I know have had all sorts of problems with other 
>> materials.
>>
>> On Thursday, May 26, 2022 at 6:48:48 AM UTC-7 martin martin wrote:
>>
>>> I like it!
>>>
>>>
>>>
>>> ~
>>> *[email protected]*
>>>
>>>
>>> On Thu, May 26, 2022 at 6:40 AM Neil QQ <[email protected]> wrote:
>>>
>>>> Here's a 3D printed colon light pipe design for anybody that's 
>>>> interested.  A standard T2 neon lamp sits inside the pipe. 
>>>>
>>>> [image: Nixie Colon Light Pipe Installed.JPG]
>>>>
>>>>
>>>> Units=Inches
>>>>
>>>> [image: Nixie Colon Light Pipe Drawing.JPG]
>>>> The pipe is 3D printed with clear material.  A scrap piece of tubing is 
>>>> used as a mask to block light transmission except for the colon dots.
>>>> [image: Nixie Colon Light Pipe with Mask.JPG]
>>>>
>>>> The stl file is attached.
>>>>
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>>>> .
>>>>
>>>

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