@timcurtis67 said in Using 2 Inductive Z-Probes:
You could also just mount the sensor on your bed and probe both tips on the same sensor. Then you only need one sensor. The goal is to find out the difference between the 2 hotends.
That could work but I want to probe 3 points to calculate tilt of the bed for auto-leveling which means I would need 3 probes, instead of just two.
@dc42 said in Using 2 Inductive Z-Probes:
The only input that is suitable for use with PNP output sensors is the Z probe input (with 2 resistors to reduce the voltage). So you would need external circuitry to switch between them. Whereas NPN output sensor can be connected to 3 different endstop inputs, which you can select using M558.
Okay so lets say I use two NPN sensors instead. How would I go about wiring and configuring them both if I'm using the E0 input for the U axis limit switch?
Hello,
I'm about to start assembling my custom IDEX (Independent Dual Extrusion) machine and I plan to use inductive probes to calibrate the Z offset for each tool head. My question is how to wire two PNP inductive sensors and configure the firmware for them.
For leveling I plan to probe the bed at 3 points with the first tool head to compensate for tilt and to gauge the Z offset, then use the second tool to probe the center of the bed to calculate the Z offset for the second tool head. I'd like to use the calculation of the tilt done by the first head for both tools (i.e. instead of probing 3 points with both tools which might give slightly different tilt calculations)
This will essentially allow me to use tools with different Z heights (i.e. E3D V6 and Volcano). I understand that I give up the ability to dual print.
Closing thread, no longer interested in using BLTouch sensors.
I'm glad it's working for you. So can you confirm that it is adjusting the tool Z offset in the correct direction?
Oh no I haven't actually tried it yet, I'm just saying that that method will work for my needs. I'm nearly finished with the design of the prototype, I'm just waiting on quotes back from a few suppliers. I just wanted to make sure I understand as much as I can so I don't waste any money on parts that need to be changed.
Current version is v3. Should be no problem to pull dimensions from the .brd file on Github.
This is just for the board, not the LCD. Also I'm not sure how to extrapolate dimensions from this file type.
I'm wondering if anyone can provide any documentation on the current version of the PanelDue being sold from the website. I'm specifically inquiring about the 5" version, I would like to know the dimensions (technical drawings would be great) and position of mounting holes. Also what revision is it, 2nd or 3rd? All the case files I've seen are for the 1st or 2nd version but I've seen comments online about users with the 3rd version.
I looked at the github but it only has cad files for the case for the 1st and 2nd version and no dimensions of the board.
In firmware 1.20beta1, which I am about to release, you can use G30 S-2 to probe the bed and adjust the Z offset of the current tool, instead of adjusting the Z=0 position. But if you want to do ditto printing on an IDEX printer, you need to get both nozzles at the same height anyway.
Works for me! I probably won't do any ditto printing though, but we'll see.
You only need a z-offset for the second head, why would you use two probes?
Kulitorum
So you don't have to calibrate the Z offset of the second head manually. The value might need some tweaking but at least you wont have to manually re calibrate after doing any work on the printer. This becomes especially important if you're not using 2 identical toolheads (i.e. E3D V6 and Volcano)
Hey Stephen, it's Adam Steinmark from the Google+ community. My design is very similar in movement style to the BCN3D Sigma, I'd post a pic but the CAD is in a weird spot at the moment and it's not extremely clear. I looked at your posts on this forum and saw the following from the developer:
"The Duet can support multiple Z probes and let you switch between them, so although I am not aware of anyone having used an IDEX system with separate X axes and probes, it is possible in principle.
You could connect one Z probe to the E1 endstop connector (E0 is not free on an IDEX machine) and the other to the Z probe connector, and use probe types 5 and 6 in the M558 command to select which one. Or you could connect both to the Z probe connector and use an analog multiplexer IC to switch between their outputs, controlled by the MOD pin on the endstop connector, and use probe types 1 and 3 in the M558 command.
You would probe with one head/probe and save the height map for that. Then with the other. The G29 command on the Duet allows you to specify the name of the height map file, so you can use a different filename for each head. Then in the tool change macro files you would load the height map file for the head you are switching in.
Bear in mind that if you want to do ditto printing (print 2 copies of an object simultaneously), then you need to match the nozzle heights accurately.
HTH David"
Did this work for you?