@dc42
"RepRapFirmware is open source so you are at liberty to modify it to meet your own requirements."
Wonderful; that's really great to hear and to see the explanatory comments throughout the code.
It's really refreshing coming back to the 3D printing/open source community and seeing all the progress that's been made!
I have a (genuine) duet3 board coming in the mail and can't wait to get started; happy to support you and the duet team and to be a part of this ecosystem. Thanks!
@o_lampe Ahh, gotcha. Okay.
My modified understanding:
For extruders:
E1, E2, E3, E4
For motion:
X,Y,Z,U,V,W,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,t
(motion could use other lower case letters or A,B,C,D, but total number of axes cannot exceed 32 30 based on some internal limit)
Thanks for clarifying!
@deckingman
Could you please provide a link or product name so that we can take a look at what you are referring to for your alternative material under heated bed?
Thanks!
@dc42 Great, thanks for the clarification!
I am in the process of designing and laying out the wiring for a printer that will have multiple Duet3 mainboard 6HC's (5 in total) used as expansion boards.
I would like to understand if any consideration should be given to which components are wired to which mainboards.
IE does it matter which mainboard is used for:
I would like to optimize for low CANFD bus load and therefore, my thinking is to keep as many components on the main mainboard as possible. Homing switches will only be used during startup when bus load will be load, so shouldn't matter which mainboard wired to.
I don't have a good grasp on what can be sent in a single CANFD message. If commands for all steppers and all heaters outputs can be sent in a single message, perhaps it's only important to keep the thermistors wired to the main mainboard to avoid a message from thermistor mainboards back to main mainboard.
Is my thinking correct here? Please ground my thinking and provide any insight you may have.
Thanks for your help and a great community!!
@dc42
Thanks, that helps.
I think I will use something like these RJ11 phone splitters to keep the junctions easy, clean, and (maybe shielded?)
https://www.amazon.com/Phone-Splitter-Telephone-Suitable-Machine/dp/B0B1D9775P/ref=sr_1_19?hvadid=409957000450&hvdev=c&hvlocphy=9031520&hvnetw=g&hvqmt=b&hvrand=13040326026356310989&hvtargid=kwd-11735544458&hydadcr=19108_11276318&keywords=rj11%2Bline%2Bsplitter&qid=1689094335&sr=8-19&th=1
@kuon
How has your project turned out? What did you do here? Any issues with CAN communication?
@T3P3Tony
As I understand, 2 conductors will need to go to each pin for CAN1_L and CAN1_H for the middle main board(s).
I've created a diagram as I understand the wiring should be. Is it correct?
How is it recommended to make the junction? Insert two wires into the RJ11 connector for each pin? They are made for 1... seems like it will be wonky or not work when inserting two.
(if it's helpful for reference, cross posting from https://forum.duet3d.com/topic/31190/increase-maximum-number-of-axii-to-30)
@Thorpydo
Hmmm, the RJ11 connector is made to accept one wire per pin, and it gets inserted instead of crimped.
How best to handle the junction here?
@DIY-O-Sphere
Perfect, that's really helpful.
It looks like my understanding of the CAN connection was incorrect (two separate buses vs two connections for one bus).
I've created a diagram to make sure I understand how to correctly wire.
https://imgur.com/a/CbCiCU1
Is it correct?
Thanks for the help here!
@dc42 said in Increase maximum number of axii to 30?:
When a 6HC is used as an expansion board, a single CAN message contains the movement information for all 6 drivers. So only 5 CAN messages would be needed per move even if all 29 motors move at once.
After reviewing the hardware configuration documentation and CAN bus interconnects, I was thinking that it would be easier to use x1 mainboard 6HC and 8x expansion board 3HC's because each expansion board comes with 2x RJ11 connectors and termination resistor is straight forward.
However, after re-reviewing this thread and DC42's comment above, it sounds like it I should optimize from a bus loading perspective and keep the number of boards to a minimum, thus 5x mainboard 6HC's, using both CANFD-0 and CANFD-1 connectors, and bypass the termination resistor on the middle 3 mainboards; first and last mainboards using CANFD-1 connector.
I see in the revision notes for mainboard 6HC v1.02a:
"improved the CAN-FD termination resistor bypass solder jumper design to make it easier to use the 6HC as an expansion board."
Where do I find documentation or detail on bypassing termination resistor for the mainboard 6HC v1.02a?
Does this all sound appropriate?
@o_lampe
Thanks!
I might have to clarify how to use the M595/look ahead buffer when I'm ready for that.
Currently, the slicer outputs extrusion in absolute mode but I would like to change to relative extrusion mode. It looks like that will be no problem and I can use M83 in start Gcode to do so.
Here's a single line gcode output; I believe this matches what has been discussed and aligned on in this thread:
G1 X556.90665 Y559.4645 Z559.4645 U556.90665 V564.15183 W564.15183 a556.90665 b559.4645 c559.4645 d556.90665 e564.15183 f564.15183 g556.90665 h559.4645 i559.4645 j556.90665 k564.15183 l564.15183 m111.49454 n113.41718 o113.41718 p111.49454 q111.36289 r111.36289 t-14886 E0:2712.35717:1611.15904:25136.476 F250
Thank you all for guiding me here!
@droftarts
Perfect, that jives with above. Thank you!