Tronxy X5S Piezo Z-Probe (Drucktischauflage)

thingiverse

I was inspired by the Piezo20 project to experiment with using piezoelectric technology to level my 3D printer's printing table. This solution works great for me. The idea is to utilize these elements as supports for my printing table. The table is guided only by two middle screws. It's ideal to file the threads in the lower half of the guide screws so that the rods are as smooth as possible. I used this board: https://www.aliexpress.com/item/Pr-zision-Piezo-Piezo20-Z-Sonde-Sensor-Z-sonde-f-r-3D-drucker-revolution-re-auto/32838467207.html. You can use the cheapest set since only the board is needed. In addition, I bought 20 x 20mm piezos for about $1.50 on eBay to have enough for tests. However, I haven't used up all of them except for four that I'm using now. There are several different editions included so that the bed can be aligned halfway. But it's not really necessary because you can easily use ABL or UBL. I have an 8mm alu plate as my print bed and here I only use the tilt version, so no mesh. Of course, I also use the sensors as Z-limit switches. It's over when you ride out of the table. In addition, it's now easy to change the support without having to change the settings for the Z limit switch. In my experience, it makes sense in the printer firmware to adjust the Z-Probe about 0.1 mm below the head. Some pressure has to be exerted during Homen or Levels, resulting in a shift of just this tenth of a millimeter. In several experiments, I compared the measuring points of a 9x9 mesh. The largest deviation over all runs considering all 81 measuring points was less than 0.04 mm. It doesn't matter whether the bed is warm or cold, whether it's just heating up or cooling down, or whether there's electricity. What the system does not like is too fast acceleration of the Z axis. My stands on 50mm/s^2. For assembly: The holders are simply placed on the cross beams, the sensor with the ceramic upwards and one of the bed support buttons with the Knubbel down (recess over the soldering points) inserted. Then comes the printing table. Electrically all sensors hang parallel to an input of the board. I've connected all the sensors with about 20cm long cables in the middle under the printing table and a long two-core cable then leads to the board. The settings of the two pots on the board are a bit fiddly. I did it to me that I inverted the Z-Endstop in the firmware. The LED on the board must then be off in idle mode and go on briefly when touching the sensor. From this starting point, you can then play with the pots until the sensor no longer reacts in a Z-Move, but at table touch already. If you have questions, just use the comment function.