Thursday, October 09, 2025
Hypodermic Tip As Deposition Probe ... Nah.
Well I had a hypodermic needle probe in, and there was some resin, so I tried it as a deposition probe. Not very good results, wasn't really expecting much. Here's a micrograph:
Initial contact point is the top left of the square. White lines are probe tracks in Sharpie, blobs on the corners are cured resin. The sides are roughly 100μm a side (sorry, done manually) and so the blob of deposited resin looks to be roughly 30-40μm diameter. Not good enough. Will have to make a proper micron probe, which last time got me better than 10μm dots.
Aside on microscope image sensors: This cheap one (sub-Mpixel) I'm using here is heinously sensitive to IR light and grubby as all heck. If I try illuminating the sample with a halogen bulb it instantly whites out. Had to take this using the LED desk lamp. Better 23mm dia USB image sensor is on my Xmas list if Santa is listening...
