RepRap: Blog

Now the probe is reasonably consistent over 200μm or so, I thought I'd have a stab at the 300μm test image with 15μm spacing. Here's how it came out:

The consistency of the dots is much improved, and we can start to see other variations in a useful way. There were other attempts, of course. Some of the test prints did not show white, photographable dots because they were only partially embedding into the Sharpie layer!

I did a series of dots at decreasing height of 1μm by the way, and the Sharpie layer is about 4μm thick. 

So looking at that with a calibrated MkI Eyeball I'd say our current hardware limitations are an accuracy of about 10μm on the XY plane, similar backlash, and within a couple of microns of height over 300μm of planar movement. So let's work within those restrictions for now.

The latest test results on height showed that the levelling bodge was likely stable overnight. I retested it, tested it in the same place, moved Y +100μm, tested that again, and finally did a test of Y +500μm. Results show some linear displacement on X, but I'm not going to fiddle with that for now.

Next steps, put "dipify" code into the PNG plotting script, put Probe One in the machine, and test some resin deposition. Of course, something else will come up...