E3D PZ Probe

fma

Hi!

I'm wondering if some of you is using a E3D PZ Probe?

I plan to mount one on my modified FLSUN SR, but I didn't find any documentation about the idle pressure I should (not) apply to the piezo element...

Here is my design, with a modified effector, and a custom mount for the extruder (genuine Bondtech GLX Lite) and the hotend (genuine Phaetus Rapido 2 Plus HF):

https://cad.onshape.com/documents/19fff3683d4080f810beb21e/w/e18f2a4ce6a69f33ff95fd56/e/1af0fe0f40b14b4d0efb2e8c

The PZ Probe is sandwished between the plastic mount and the hotend heat sink.

Does it seem correct to you?

Thanks for your feedback.

droftarts

@fma I found this here https://e3d-online.com/pages/e3d-support-pz-probe, under Setup guide > Piezo Washer Mounting

1Nm of torque applied to a screw going through the PZ-Probe Washer to preload the Piezo sensor. Ensure the screw has thread locker once you have it up and running (note that it can cause embrittlement in ABS) – as the screw coming loose over time will result in inconsistent probing. The actual torque value can be different, keeping the torque consistent is key.

PZ-Probe Washer should be placed between two hard, smooth surfaces, covering all the washer to provide more reliable triggering.

If the washer is going between two surfaces with a mounting screw – ensure most of the load goes through this screw. Having multiple screws will result in reduced sensitivity. It’s vital to have the Piezo element protruding from the mating surface to ensure the actuation is applied to the Piezo element and not the mating surface.

Any good?

Ian

fma

Thank you very much!

fma

I see on their example they mount the PZ Probe perpendicular to the probing direction, so a tork is applied to the probe.

In my case, I planned to mount it on the hotend heat sink:

PZ Probe mount

The problem is I don't have any screw in the center, but 4 on the outside perimeter. And as they give a tightening torque instead of a force applied on the probe, how can I know how to tighten my 4 screws?

Their documentationcould be better, with schematics with the different way to mount it, instead of a single picture of a specific usage...

fma

According to E3D guys, the piezo can't handle non uniform pre-tightening, as it may crack the element. That's why they use a central bolt (they use a drilled screw to let the filament pass through).

So, I designed a similar setup for my hotend :

PZ Probe

I can screw it on the hotend, and on the mount. This will require to drill/cut a standard hex screw, and CNC the 2 other parts (or have them 3D printed in metal).