Will there be BTT Eddy Probe support in the future?

Sovol SV08
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62

This guide is not very clear but that is the most complete that i found : BTT Eddy · vvuk/eddy-ng Wiki · GitHub

Basicaly, you have to :

  • Move into klipper mainline (without i trust that is impossible for now because you can not fash the MCU)
  • Install the probe adaptor (ABS or ASA required… with a very good print, not so easy)
  • Follow the software Installation
  • Soak your bed with the eddy very close to the plate. If you want to use it with hight temp, try to preheat your eddy to 60°c (that may require around 30min with a bed around 80°c)
  • Perform the G28 XY move to the middle of the plate then PROBE_EDDY_NG_SETUP
  • Make a bed level with the paper
  • Be ready to call the emergercy stop… (just in case, that is not expected to have any issue here)

Now, all is usualy fine. If no issue, you can save and continue the config. If not, check the documentation, there are more complexes process (but basicaly, if that does not work it’s probably an issue with the mount of the eddy, that is better to restart from the begining).

So, now :

  • You have to change your macros :
    • homing overwrite : basicaly, yo uhave to ensure to perform the X/Y before the Z. That is the same for the stock probe so you have probably to replace by PROBE_EDDY_NG_PROBE_STATIC HOME_Z=1 on the Z step
    • print start : you will need to perform PROBE_EDDY_NG_TAP in addition of the G28 Z
    • => you can see my files here : SV08 BIGTREETECH EDDY Duo Eddy Coil - #20 by mistral (to help, no to “copy/paste” : each one have too many custom config at this step, ensure that is coherent with your own costomisations)
  • Then you can try G28 + PROBE_EDDY_NG_TAP => both should works “out of the box”. Be ready (again, just in case) to call the emergecy stop (but to not click too quick, the probe will touch the bed, that is expected, if that force on the belt, that is not).
  • In addition, you have to check if the Z0 is realy the right 0 (again, with a paper). If not, there are some fine tuning explained on the documentation (test the repeatability and if that is always the same, accept the gap, you can fix it in the eddy ng config).

Now all is properly configured. Stay attentive on different behaviours during the print start for the first print in different bed temp* (to be sure, i had some issue because that i wrongly followed some instructions).

PS: *Because that is not “so easy” i ignored so corner customisations in my todolist… but if you want to improve, you have some recommandations for bed mesh and QGL (usefull too but not fully required).

63

Oh, and I don’t know about you, but I was super stressed about doing this setup (modifying the Z endstop is super dangerous). In reality, I was never at risk of causing any material damage, but here are some potential risks:

  • The QGL, because it’s executed very quickly, if the delta between one side and the center is greater than 3mm, there’s a risk of hitting the bed at high speed (3mm is a lot, but it might be a good idea to be careful).
  • The Z return must be done on the center plate. If it’s done outside, it will never stop (this is basic advice, but be careful with macro print starts because the probe is very slightly offset from the original).
  • Generally, any rapid movement on the bottom of the bed should be very carefully observed in front of the machine (nozzle cleaning, etc.).
64

I am going to try it in pctg, it’s been doing pretty well for temperature resistance

65

Some people did it as I saw, that works for few days (testing) but this part is between the bed and the nozzle during all the print. Temp around 60-70°c is expected for mixed type of printing (that is very close to the capacity of petg : around 75c, in my opinion that will generate random issues soon).

66

I’ve heard good things about PCTG. What is your experience overall with it compared to PETG and substituting it for ABS?

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67

Better than

68

Someone on this forum with a Zero should print these Eddy mounts in PPS-CF (heat distortion temperature of 250 C) and sell them near cost to other forum members with an SV08 that needs an Eddy.

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69

Has anyone considered eddy current sensors other than the one from BTT?

This one offers real time bed tracking (if you wire it to the mainboard not the printhead) and is a much smaller package to mount.

Has anyone seen/used this product?

70

Interesting. I would be interested in knowing some other brands as well

71

Good idea! Who do we know with a Zero?

Sorry - couldn’t help myself :man_shrugging:

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