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From:	"miloh (miloh AT froggytoad DOT net) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject:	Re: [geda-user] DIY PCBs --> UV laser printer
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On Mon, Jun 19, 2017 at 1:14 PM, Larry Doolittle
<ldoolitt AT recycle DOT lbl DOT gov> wrote:
> John -
>
> On Mon, Jun 19, 2017 at 02:40:25PM -0500, John Griessen (john AT ecosensory DOT com) [via geda-user AT delorie DOT com] wrote:
>> On 06/18/2017 02:57 PM, Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>> >To print pattern with UV laser printer directly on PCB treated with photo resist will probably produce a very good result but I
>> >have not find printer for sale and guess they are very expensive.
>> A raster printer with UV light would be a good product that would compete with the CNC mills for pcb
>> production.  I don't hear anything about UV LED arrays, so probably swapping a UV laser diode might work in
>> a normal laser printer design, but have not heard of UV laser diodes either.
>
> http://hackaday.com/2017/06/15/laser-pcbs-with-ldgraphy/
> https://github.com/hzeller/ldgraphy
> Home-brew, "open source", using a 500 mW UV laser.
> "fully operational with a reliable resolution of ~0.15mm/6mil"
>
>    - Larry

Henner's latest tests look amazing:

line test post on GooglePlus:
https://plus.google.com/+HennerZeller/posts/a8taHWeL5CC
Note the followup conversation:  moire patterns in the image are due
to image conversion settings -- the moire produced in mechanical
dimensions is not visible in the shown image.

Image output video: https://plus.google.com/+HennerZeller/posts/LEEdE5KDM9J
Note the copy of the early MC Escher woodblock at the end.

This is a remarkably low cost machine solution with matching or excess
accuracy compared to other possible hobby/technical level prototyping
flows; a good set of tradeoffs to consider if you are interested in
building one of your own.

Henner Zeller accepts pull requests.

-ronald miloh alexander

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