Although I beleive most firmwares only support up to 3 hotends...]]>Use the right most front, you'd be technically -15 to -25 ... Use the front left most you'd be +15 to +25 off axis from 0,0...
Check the technical drawings to be sure...its then just a simple maths problem
]]> Although I beleive most firmwares only support up to 3 hotends...]]>]]>Weight would actually be reduced, as it is a pure bowden setup.
I almost want to use some kind of external shift register or some extra pins to have it select the drivers. I wonder if you could have the cheapest printer board money can buy and then use that for extruders? lol
They usually have 4 axis so..
Can someone run two printrboards or sang's or ramps or whatever?
yeah, shift register, mux, its only the surronding circuitry that gets tweaked and the software codes - but same same outcome.
And yeah, if you google around, adrian bowyer i believe had a modified marlin to send gcode to a second board to drive multiple extruders as part of his colour mixing experiments....
]]>They usually have 4 axis so..
Can someone run two printrboards or sang's or ramps or whatever?
]]>You know, thats a good point.. How could you make the program send the right sleep/enable signals to each driver? I didn't know that was a feature.
Send M84 E to disable the Extruder until the next extruder move, and thus sticking the stepper driver in sleep mode (well, disables it via its enable pin anyway).
As for getting it to switch the appropriate mux (i'm imagining this would be best done as digitally switched small ssr's driving some *FETs.... ) ; then right now, would be easiest to run it through a post-process filter in RH that simply looks for the various snippets of tool-change gcode and does a simple 'insert line with M84 E ; M42 P7 S255; M42 P8 S0; M42 P9 S255' ; where P7, P8 and P9 are the mythical pins I have chosen to be the inputs to the mux to switch the input states to the steppers motor header and 0 or 255 control their state. The next extruder move will auto-re-enable the stepper, so no need to worry about that part. Would be easy enough to do this in python, perl, php or whatever your preferred script poison is. Meh, slic3r via its custom g-code might have some ability to add extra tool-change code anyway, in which case, it can be all done sans script....
Anyway - thats one way you could skin the cat.
]]>You potentially could do it all of a standard sanguinololu with just a small carrier board...
]]>How does one go about getting four bowden extruder drivers though? lol
Well actually I suppose you could just print them..
]]>