Vyper Strain Gauge

[BesbesCat]

Hello guys.

So I own an Anycubic Vyper with a strain gauge attached directly to the hotend.
It has a built-in ADC that sends a digital signal to the main mcu directly without the need to do any signal processing.

I hacked my printer.cfg to implement homing via the probe, disabling both z endstop switches.

Right now I am homing at the edge of the PEI sheet at the center. This area is mainly used to remove the PEI sheet from the bed.

I can confirm that it produces consistent first layers with no z-offset calibration even after a couple of nozzle changes and a complete hotend disassembly.

Here’s a video of the homing process:

Anycubic Vyper Strain Gauge Z Endstop

I slowed z homing speed to 1mm/s for the video. I still set the speed at 3 mm/s lower than the default 5 mm/s I used for this probe for ABL. Speed doesn’t seem to affect the results of probing.

Now the question is. Is it okay to run the printer as such? Any advices against not doing so? I have only been testing that for a week or so with no issues so far. Am I missing something here? Why hasn’t the manufacturer thought of doing so?

Sorry if my comment isn’t about the exact implementation you’re working on but I am willing to contribute to your work with testing/debugging/coding if needed.

Many thanks

[Sineos]

Since your question is not related to the development work that is done in this thread, I moved it into a separate post.

[TheFuzzyGiggler]

If it’s giving you a consistent first layer there isn’t necessarily any issue with that.

Usually people use the center of the bed because, by default, that’s where most prints start. That and it’s typically the most stable position. The edges of the bed have a tendency to flex if they overhang where the bed is mounted.

Again though, if it’s giving you good results, stick with it.

[BesbesCat]

Thanks for your reply.

I went with the edge in case of a nozzle crash. Since this area of the PEI sheet has no bed underneath it and I thought this gotta be safer. It doesn’t show much flex though. The strain gauge is quite sensitive and is triggered almost immediately.

Now why Anycubic hasn’t implemented this in the firmware as a stock solution? The hardware is fully capable of such implementation.