I had my SV 08 for a few weeks now and I am not happy about how unreliable the first layer is. I start a print and see that the first layer is not the way it should be. I use micro steps to adjust z -z-offset, then save config and with the next print, the first layer is bad and needs adjustments again…
I know bed is not perfectly flat, but that should be ok, that’s why we have mesh probing…
I would first like to know what actually causes problems with the first layer.
Is it the probe that triggers at different heights depending on temperature or for any other reasons?
is it because the shape of the bed changes after it was already probed?
If it is the probe are there any probes that could be recommended? I have heard of Panasonic gx h12 or Superpinda by Prusa. Has anyone tried one of these? Could they be a solution?
If it is the bed then what options do we have? By the way, heat soaking for a long time is not a satisfactory solution. Are there any good replacement beds available?
EDDY or cartographer require mainline Klipper. I would like to avoid going the main line, but I will do it if it is the only way do get good first layer. Moreover, if EDDY could solve the problem that would mean that there is a problem with probing, not the bed. Don’t get me wrong, I know that the bed is not flat, but modern bed meshing should be able to cope with this.
I have an old bed slinger with bltouch clone and my first layer on that printer is more reliable than on SV08. Come on… something needs to be done…
I have installed a regular M12 sensor on my SV08 and haven’t had any issues since.
It’s a bit heavier than the stock one, but the fit is so perfect next to the extruder and within the case I think this was one the first choices when they were designing this printer and the current sensor was a lighter backup plan.
Not sure what you mean by ‘how do I save the settings’…
I have a macro for it and after calibrating the z offset with microsteping while the first layer is printing at the end of print I run my ‘save config’ macro and in my printer.cfg I get updated z-ofset.
## <---------------------- SAVE_CONFIG ---------------------->
## DO NOT EDIT THIS BLOCK OR BELOW. The contents are auto-generated.
##
## [probe]
#*# z_offset = 2.870
I recently have been getting better results after probing z axis 3 times and averaging after homing z. Then if I heat soak just for a minute 5mm above the bed at 65 degrees before making an adaptive 9x9 mesh with 3 tries at each point I get a reasonably decent first layer. So maybe just a short heat soak is enough?
How did you wire it up? Did you cut the sensor cable and then crimped the connector to plug it to the tool head the same way as the stock probe was connected? Did you have to change anything in the config files apart from obviously tuning the new x, y and z offsets?
This sensor is chap and looks like it it should be an easy to swap job, so I think I will give it a try.
The only change in the config (depending on if the sensor is normally open or normally closed) is to inverse the signal with an exclamation mark in front of the i/o port setting.
The x and y offset stay the same because the same sensor position is used, the z needs calibration.
I mounted the sensor end flush with the bottom of the extruder bracket which gives all theeded clearance for good detection and leaves more than enough clearance between the sensor and bed when printing.
I indeed re-used the existing wires from the old sensor, the wire colors were the same for me but double checking wont hurt.
Why not order one from Sovol ? I did it is used on the sv06/7 ptinters and the connector is the same one that is used on the SV08. The adapter can be found on Printibles
Hope this helps
Cheers. Mike Irish
