Printer Model: Tronxy 500
MCU / Printerboard: Spider V2.2
klippy.log
My BLTouch works fine, but the pin is deployed sometimes during print. That of course a big problem and already bend the pin.
Acutall I face an offset of -0,25 but it still works.
Want to finde out the problem of course.
Anybody else did have this misbehavioir?
do you know the code to bring the pin down and up?
Thx!
This tends to happen if your printer is moving at high speeds and accelerations. The bltouch can’t handle that due to the shaking, and randomly drops the pin.
already on 1. layer he drops at 30mm, speed may not be the problem here
I think of power supply, but will not finde anything there.
Also I hear he performes the drop and pull up as usual.
had a try right now with verrrrry slow movement, the BLTouch dropped.
do not think the Log will show anything?
klippy (11).log (3.6 MB)
Never seen such behavior. Could be simply defect.
In any case, what is the reason for this change pin_move_time = 0.15?
cannot remember changed that, what is the original setting?
Just comment or delete it and the default is used
thinking of replacing, but again a BLTouch, is there anything better out there?
in the package of the BL there are two springs? for what are these used?
do not find any specific hint in the doc
could it be that the drop signal from the Spider V2.2 is sent?
maybe a double used output pin?
Never had the issue but check https://www.youtube.com/watch?v=eDfGZ4bjxiM
Fun fact, the bltouch uses a magnet as pictured. So there are two things besides vibration that cause the unintentional deploying of the pin that I know of.
1.) As in regards to the magnet, when the bltouch gets hotter, the already weak magnet loses its ability to keep its magnetic properties. Case in point, if anyone remembers the mechanical rice pots with the one mechanical switch? When you press it down the magnet in the thermostat sticks as long as the temperature does not raise above boiling. When it does, then it clicks off to warm. The first rice pots required 15-minutes more cooking after the ding!
Solution:
To resolve this issue, put a fan on the bltouch, works.
2.) If the bltouch experiences the equivalent of a brownout, the pin will deploy during printing.
Solution:
To resolve, put an electrolytic capacitor on the power to the bltouch, works. 0.47uf is more than enough. MKS Robin Pros have this issue.
/retnel
I will not put on a fan 
I have a capacitor of 100yF, the short pin on Minus, the long on Plus?
means parallel mount of the cap?
yes it has, the short is Minus
direct parallel and fine?
Parallel: Yes
Fine: 
if the pin drops again, I will install the cap
