Itty Bitty Double Extruder

[clough42]

I'm amazed, could I ask what software you're using for designing such a awsome work of art?

This particular design was done in SolidWorks. I'm glad you like it.

[OldSourKraut]

I have already started printing and sourcing parts for this project. I'm truly excited to get started on it. I have been using your hexagon cooling shroud and z-probe servo mount and am very impressed with the solid design. My question is have you had any issues with the 3cfm fan cooling both hotends on extended prints? It has been doing a good job on my single hexagon hot end, but I would be doubling the heat in that area.
Also how critical is the spring tension used on this build? I have a hardware store across the street with a good selection and I'm hoping I could bring my completed extruder over there and find something that would work.

[clough42]

I have already started printing and sourcing parts for this project. I'm truly excited to get started on it. I have been using your hexagon cooling shroud and z-probe servo mount and am very impressed with the solid design. My question is have you had any issues with the 3cfm fan cooling both hotends on extended prints? It has been doing a good job on my single hexagon hot end, but I would be doubling the heat in that area.
Also how critical is the spring tension used on this build? I have a hardware store across the street with a good selection and I'm hoping I could bring my completed extruder over there and find something that would work.

Thanks.

I haven't had any trouble with the 25mm hexagon cooling fan so far. The shroud is designed to concentrate the airflow around the heat sink fins. I've run a couple of 8-hour prints with no issues--one with $10 Sunon maglev 3CFM fan (which I highly recommend) and one with the 25mm fan shipped with the Hexagon. The cooling fins get warm, but I can easily hold a finger on them. Printing with both hot ends at 250C over a 110C bed, the heat sinks get up to around 45C, with no jams.

For the springs, I recommend 1Kgf per spring as a starting point. I found some springs in a Harbor Freight spring assortment that I cut in half and bent new hooks. These grip the MakerFarm ABS very well with the MakerFarm bolts. I.e. they can transfer more torque than the motors can deliver. I haven't sourced anything specific yet.