Itty Bitty Double Extruder

[RobH2]

Excellent. What's your "Live" setup? I think I should do one too soon.

[JRDM]

As I was building this and testing it with 'clough42' I was interested in the weight also. I weighed my standard Wade's extruder (Magma hot end) and it was 607 grams. The dual hexagon weighed 701 grams. Not bad to add less then 100 grams to get a dual rig.

One nice side effect I've found is that if I'm careful, I can swap filaments out on the head that's not printing (if I'm not doing a dual head print) and save time. I'm printing with PLA now on my left head and I just switched out the ABS on the right head to nylon without messing up my print. That's nice.

OK. I had managed to build a working 600g duallie, but with J-Heads. I have lighter motors to try to reach 500g but I've been just getting my practice and testing in before I built another set. I planned on my second build to have Hexagons and the lighter motors.

[JRDM]

My dual belt-driven design:
https://www.youmagine.com/designs/jd...-dual-extruder
600g version shown

[beerdart]

Love the design thanks for sharing.

[clough42]

Excellent. What's your "Live" setup? I think I should do one too soon.

Nothing fancy. Just a webcam and a YouTube live event. https://support.google.com/youtube/answer/2474026

[clough42]

Here's a time-lapse video of the link cup printing.

[lemming]

Hi

Could you put me down for a hardware kit too?

Will need shipping to Australia...

[clough42]

Hi

Could you put me down for a hardware kit too?

Will need shipping to Australia...

No problem. I'll post back here when they're ready.

[beerdart]

clough42 Do you have a version for the NEMA 17 motors? as we already have them from our failed direct drive dual experiment. If not it should be easy for us to modify..
Thanks

[bobe99]

Nice design!

I was wondering on the physical connection and whatever Marlin changes are necessary.

In Marlin, my guess is that we need change MOTHERBOARD from 33 to 34.

That translates to the following physical connections on the Ramps 1.4 board:

• D10 = Hot End #0 (12v)
• D09 = Hot End #1 (12v)
• D08 = Heated Bed (12v)
• D11 = Servo (5v)
• D04 = PLA Fan (12v)

My questions (assuming the above is correct):

1. What Fan Expander are you using? I see one from Makerfarm which states it exposes D4/D5 and one from Geetech which exposes D6/D11.
2. Regardless, how is the servo connected? The Geetech usurps all of the servo pins and only directly (via pin headers) exposes the 4 fan pins (D4/D5 or D6/D11) and 2 pins for an external voltage source. I cannot find any info on the Makerfarm version (other than the description supplied on the Markerfarm website), but the Geetech has schematics that clearly show a common MOSFET gate voltage. So my question is how does this thing power both the 5v servo and the 12v fan though either of these gizmos? I mean, how does either of these adapters handle both a 5v servo and 12v fan?
3. Can you supply all of the Marlin changes you have made? E.G. Any changes in pins.h? Any changes to support the belt systems?

I'm really skeptical of the Makerfarm fan expander (just due to the lack of documentation, no photo of the other side of the board and the off-hand comment implying it does not provide a buffer between the ramps and fans).