Draw conductive lines on curvy rubber

Other Hardware General Electronics
1

I want to draw conductive lines on a curved rubber thing. The lines can't be any wider than 1mm each need to be thinner than 5/3 mm each; they need to be parallel each other and at 10/3 mm intervals. Graphite drawn on the rubber thing didn't seem to work.

Is there a conductive ink pen that is thin enough?

Or where can I buy conductive ink in a bottle for less than this?

Or is there some other way I might add these lines?

Thanks

2

Does it have to flex?

1mm is very narrow.

3

bill2009:
Does it have to flex?

1mm is very narrow.

It doesn't need to flex. And yes, 1mm is quite narrow.

4

Caig CW100P Circuit Writer Conductive Ink Pen

Circuit Works - CW2200MTP Conductive Ink Pen, Micro Tip

5

johnwasser:
Caig CW100P Circuit Writer Conductive Ink Pen

Circuit Works - CW2200MTP Conductive Ink Pen, Micro Tip

Are you sure? I ask because adafruit suggests that the CW2200MTP is too thick.

Also, my non-math was wrong; the lines can probably be almost 5/3 mm wide. But that still is uncomfortably close to the width that adafruit reports.

6

5/3 mm = 1.666 mm

Adafruit says "The CW2200MTP (micro-tip pen) has an orifice size of 0.7 mm and will draw traces that average 1.5 mm in width."

Sounds like a near perfect match.

7

johnwasser:
5/3 mm = 1.666 mm

Adafruit says "The CW2200MTP (micro-tip pen) has an orifice size of 0.7 mm and will draw traces that average 1.5 mm in width."

Sounds like a near perfect match.

They don't report the variability in stroke width, but if it magically doesn't vary, I'd still have little room for error.

Anyway, I guess I might as well try one of these. Do you know which of the Caig CW100P or CW2200MTP is thinner?