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Dual Bowden carrier with servo, and fan mount, set up to take M4 nuts for the bowden tube holder

by cgapeart Mar 7, 2015
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How big is the hole for the push in style fitting? Will it fit the 1/8 size fittings?

I don't know. I modified http://www.thingiverse.com/thing:381027 to make this because I didn't have easy/cheap/fast access to push fit connectors. Based on the 3d model, The hole where you would screw in the push fit connector measures 10.925mm in diameter - ~0.43 inches. From the looks of things, that might be a bit too wide for 1/8" push fittings - based on measurements I looked up (1/8 NPT, the outside diameter of the threads for a 1/8 " fitting is approximately 0.405". It might work still, once you figure in plastic shrinkage as it cools for ABS.

Dual & Triple Extruder (carriage)

Thanks for the reply. I actually have posted my modifications and just added this thing to the resources as well. I have added a mount for a capacitive sensor and the fittings for 1/8 size. The original from shuttle3d may have been for a 1/8, but I never tried it as the modifications were easy to make. I would highly recommend a capacitive sensor instead of the servo actuated endstop. I used that technique for a long time and the accuracy doesn't compare to what the capacitive sensor can do. I have only done a few prints with it and can immediately see the difference in quality.

I would love to switch to a capacitive sensor - I just have not found one yet I can afford.

Do they require a metal bed, or will they trigger on the glass plate, or the metal in the heat bed PCB?

How well would this fit the Chinese all metal Jheads?

It's meant to hold j-heads/groove mount style, so it should be ok. You might have to adjust the shape and sizeing of the fan shroud to get a good fit though.

I should mention that the m4 nut traps for the bowden cable appear to work well. Note, however, that there isn't a place to put a captured nut in to screw them too - you will have to use a wood screw or the like, carefully screwed into the plastic.

Having completed my first test print, I am generally happy with it, but I think I want to make the mounting slot for the servo bigger, and move it farther away from the print heads: I have found that the heating coil in the cartridge heaters I am using can induce signals on the PWM line for the server that make it dance or grind it's gears, but it only happens when the heater has reached temperature and the control loop is flipping it on and off (thus creating a changing magnetic field). I am also working on fan shrouds to direct the cooling air to the print heads for metal heads.

How are you attaching this to your x-carriage? i dont see the stl for the carriage anywhere in the repository of the original, or in with your stls...

Funny you should mention that. I went to attach it to the "existing" x-axis carrier I had on my i3 just last night for the first time, and realized that the mounting holes on the carrier did not match the ones on the extruder head. It's a problem I will have to solve! I am using the i3 rework as the base mechanics:http://www.thingiverse.com/thing:119616

That one uses roughly 45mm on center holes -- which didn't work.

I just took a quick measurement from the sketchup file: The mounting holes are 30mm on centers. I believe this one: http://www.thingiverse.com/thing:586636 should work fine. I also think the base model from Yosef Prusa at https://github.com/josefprusa/Prusa3 can be configured to do 30mm on centers. I should have one of those in my spare parts bin from my original build, so I will likely go with that.

Prusa i3 Rework
Prusa i3 Rework X-carriage with additional holes for Wade's extruder