Z no longer goes low enough  

RE: Z no longer goes low enough

Oh, I do not want to mess with the PINDA sensor.  It was set up by the factory.  It cannot have moved as it is tightly fixed and was fine before this Z problem.

RE: Z no longer goes low enough

If you're close to or more negative than -2.000 and still can't get a good live z, your only option really is to move the PINDA sensor higher. It's trivial. Loosen the screw that holds it in place, wiggle the sensor to move it up a bit, the retighten the screw. As far as mechanical exercises are concerned, it doesn't get much easier than that.  

RE: Z no longer goes low enough

Thanks fuchsr.  Apart from my reservations about this, how accurate must the change be?  If I mark it with a pen and aim for 0.5 mm, will that be good enough?  Do I have to get the exact 200 microns to avoid the extruder crashing into the bed or sheet?

Thanks for replying.

RE: Z no longer goes low enough

Oh, you star!

I was adjusting in the 0.1 to 0.2 mm range and it seemed to make the filament skid more, not less.

After your encouragment, I eventually I got to 1.6 mm!!  I just had to be bold.  This paints a becautiful flat cake on the zig-zag section at the end.

Thank you.

RE: Z no longer goes low enough

@thebobgeezer

The Super PINDA should have about 1.5 mm distance between nozzle and sensor, so that you’re around -1 when your Live Z is correct. That gives you enough wiggle room up and down.

Instructions for adjusting the PINDA are in:

Mini: https://help.prusa3d.com/en/guide/how-to-replace-superpinda-mini-mini_179912

Mk3S: https://help.prusa3d.com/en/guide/how-to-replace-superpinda-mk3s-mk3s_179920

I put this little helper on Prusaprinters.org to help position the PINDA: https://www.prusaprinters.org/prints/57192.

Works better than zip ties or credit cards, which have less well-defined heights.