Itty Bitty Double FLEX Extruder

[voodoo28]

Thanks..i wasnt sure...cuz on his site it says coming soon.

Based on the link at the bottom of the itty bitty flex page on his site I would say this one:
https://github.com/clough42/Marlin/t...3v_double_flex or if you prefer the direct link to the zip: https://github.com/clough42/Marlin/a...ouble_flex.zip

[jasay]

Thanks..i wasnt sure...cuz on his site it says coming soon.

Yeah. The marlin configuration page does. The itty bitty flex assembly page lists this one.

[clough42]

Thanks..i wasnt sure...cuz on his site it says coming soon.

Whoops. I'll fix that right now.

[clough42]

Whoops. I'll fix that right now.

Fixed. Sorry about that.

[voodoo28]

no worries!
Im still trying to work out the positioning of the heater wires where they dont get in the way of the Z probe arm.
might need to route all wiring out through the back in order to get the probe free of any wires.

Fixed. Sorry about that.

[clough42]

Dang, and I just finished printing and dry fitting the itty bitty dual. I guess the obvious questions to decide whether to redo it or not while waiting for motors are: How much am I going to print flexible material and how much x-axis travel is lost? Only I can answer the first part. Can you make sure I'm not off the deep end in my analysis of the second part?

My machine currently homes with the endstop as far right as it will go and the nozzle directly over the edge of the glass. It travels roughly 238mm (10" model) before the carriage hits the left z axis parts, but there is another 10-12mm of glass that is not used. Switching to dual extruders without doing anything else, the left nozzle will home at x=10 (itty bitty dual) or x~=13.5 (itty bitty flex) and the right nozzle will be the same distance off the glass in free air (-10 or -13). At the far left position the left nozzle may actually use the currently dead glass, but the right nozzle will max around 228mm (itty bitty) or 225mm (flex). So in either case the left nozzle will have basically the same travel I have now, but the right nozzle will limited.

If I can redesign the endstop I may be able to move the left nozzle back to the edge of the glass at home and so would get actually more x travel than I have now (hopefully the full advertised 250mm), but the right nozzle will still be limited to max x=228/225mm. Can't say that I care much about the 3mm loss on the secondary nozzle for itty bitty double vs itty bitty flex, but will have to keep in mind that only the left nozzle can reach >225mm.

Does that sound right?

All of this assumes, of course, that the nozzles are centered on the carriage and that nothing else (motors, etc) interferes with the frame.

The nozzles are centered. If you only consider the bed area reachable by both nozzles, which is all you can use for two-material prints, you just lose the spacing width over a single extruder. So with dual, you lose 20mm, and with the flex you lose 27mm--half on each side. If you can physically increase the travel, you may be able to recapture some of the lost space by moving into areas that would have put the single nozzle off the glass.

For a single material print, you typically only lose half the spacing distance, because you can print out to the edge of the glass on one side. In your case, since you have extra glass on the left, if you print with the left nozzle, you may not lose anything.

[voodoo28]

the space is very limited in the left side..

[clough42]

initial setup...waiting on new thermistor that broke...

Did you decide to skip the ABL? Looks like your heater wires are where the probe would be.

[voodoo28]

No, I had it all setup, but when it came time to install the extruder block to the carriage, the probe arm was in the way of the extrduer/carrige mounting hole. I could not get the screw into the hole without removing the servo and arm. Snowball effect...once the extruder was mounted i could not mount the probe arm cuz the hot end was in the way..

Did you decide to skip the ABL? Looks like your heater wires are where the probe would be.

[jasay]

The nozzles are centered. If you only consider the bed area reachable by both nozzles, which is all you can use for two-material prints, you just lose the spacing width over a single extruder. So with dual, you lose 20mm, and with the flex you lose 27mm--half on each side. If you can physically increase the travel, you may be able to recapture some of the lost space by moving into areas that would have put the single nozzle off the glass.

For a single material print, you typically only lose half the spacing distance, because you can print out to the edge of the glass on one side. In your case, since you have extra glass on the left, if you print with the left nozzle, you may not lose anything.

Alright. I think that's what my long spiel was getting at but much clearer and more succinct. Thanks.

BTW, are any of the parts (idlers & pulleys probably, carriage sides & servo arm [hexagon] maybe) shared with IBDE?