[VicPiMakers Projects] I Need a dozen adapters 3d printed

[George Bowden]

Hi PiMakers with 3D printers.
I need a small item 3d printed.  It is an adapter for a wifi module.
Here a picture of the concept.  My dimensions are a little different.
[image: image.png]
https://www.tinkercad.com/things/1hrF3ju8OWE

It is a socket for holding one of these ESP8285 modules
[image: image.png]
https://twitter.com/esp8266/status/903774378042818560
The pcb board thickness is 0.74mm, as measured with my callipers.  The
module's can adds a couple of mm, but that doesn't come into the design.


The contacts are aligned front to back.

If I lay stripped 30 awg wires (0.2546 mm diameter) into the slots for the
wires, I can push the module into the board slot to make contact with the
wires.  Then I cut the wires poking through the bottom, along the board
edge, to break the connection from the front pad to the back.  I may have
to cut the wires and bend them into place beforehand if they dont slide
into place. The contacts are aligned front to back.

The Board slot needs to be  1.2492  (0.74+2*0.2546) minus the compression
of plastic to keep the wires pressed against the contacts.
I don't know the compression characteristics of the plastic used in 3D
printing. the wires may sink .1mm into the plastic. If so a slot of 1.1mm
may be right. I could fill a thticker slot of 1.25mm  with slips of paper
to get the right compression.

Here is a rough sketch.  The Blue is the part to 3D print

[image: image.png]

There are no sockets commercially available for this pitch and board
thickness.  Currently, I am using an adapter soldered to the board. My
adapter would allow removal of modules, and specific adapters for
programming.
 I would like the socket to be about the thickness of the Lithium Ion flat
battery (6mm), but the plastic may flex too much for that unless steel pins
are formed into the plastic .


-- 
George Bowden  250-893-7423
Victoria BC
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