Sv08 Microprobe mod

OK Folks, it works very well. I am still trying to figure out how to print this so that it will hold the MicroProbe steady without flexing to take advantage of the device's repeatability and accuracy. ABS, CF Nylon all flex too much even after doubling the thickness of the part. And with that I had to use heat set inserts for the screws because the mounting screw in the right runs into the heat sink for the hot end. But I am now running this as my Z height sensor even with the flexy mount since it is more accurate than the stock device.

There are a couple of electrical notes. I took the 5v from the uart port in the lower right of the print head board. So the cable for that has 3 connectors on it - the first pins 1 and 2 two run from the Microprobe to the uart port pins 1 and 4 respectively, and the other 3 run to the BL-Touch connector on the print head circuit board. CHECK YOUR WIRING DIAGRAMS, I take no responsibility for incorrectly built cables using these notes.

The pull-up resistor on the Sovol board is not of a value that will work for the MicroProbe. You need to remove the ^ from the config file and add a 10k Ohm pull up resistor from the 5v line in the cable to the 5th wire in the cable (that goes to the PB6 pin in the Sovol board.) This was confirmed by BIQU support. They are discussing adding that recommendation to their documentation after telling me at first that that pullup resistor MUST be (no uncertainty!) on the Sovol board. When I asked why, they simply said because. And after a bit more discussion including me asking them to refer the question to their EEs, they said OK do it.

So that is the information. Once I get the mounting bracket redone completely and figure out what filament to use (looking into more rigid filaments) I will post a full remix including cable diagrams and pictures/video. (edited)

I have printed this in ABS and it is far too flexible to use - the sensor is advertised as having a 0.001mm accuracy, The flex in this mounting bracket is about 100 times that much. It will make this unit far less accurate than the inductive sensor that comes with the SV08 which this is trying to replace. Nylon woul dbe even more flexible, and because of the proximity to the hot end it cannot be made of any material that is more heat sensitive than those two. I am working on a couple of options to fix it and will post that as a remix within a couple of days when my BIQU mini arrives.

I have found a 5v source in the tool head that can be used to power the BIQU mini and when I get the revision to this design completed I will include instructions for making a cable to use it. (edited)

The mount is all well and good, but without a step-down, the sensor cannot be put into operation. I don't like that something is quickly designed and this theoretical approach is sold online as if it were THE solution...

I was also thinking about this, cool solution you found on how to mount it.

Regarding the wiring, the SV08's toolhead is 24V and the Microprobe is 5v. So it cannot be plugged in directly. You could either have a small 24V to 5V buck converter or probe and find 5V somewhere else on the toolhead.

 https://github.com/Sovol3d/SV08/blob/main/Motherboard/Extra_PIN_definition.pdf

Otherwise it looks like you could reuse the data pins from the inductive probe (labled BL-Touch in the pin definition)

For those who are wondering, it seems this is for a Biqu Microprobe (not a bltouch/clone).

I have ordered the SV08, butg I do not know what kind of microprobe one would want to buy. Could you please add an example, ideally with a link where one can buy it?

I have a 3D Touch laying around (BLtouch clone), will this work with it?