Wally Hotend

Wally Hotend

Postby Cozmicray » Wed Dec 04, 2013 5:44 pm

What is the distance that your hotend (UBIS prusa) extends down below the arm?

If other hotends extend farther down, should the mounting of the Z table be adjusted
to keep Z travel maximized?

Is it possible, in the design, to have a bracket that is attached to your arms
and accept other Hotends/extruders, and maximize Z clearance?

:?
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Re: Wally Hotend

Postby Nicholas Seward » Wed Dec 04, 2013 6:22 pm

With work you should be able to attach any hot end. All you have to make sure of is that at your beds highest that you will be able to touch the hot end. The ubis I use is pretty long so anything shorter will need you to move the bed up or the arms down.
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Re: Wally Hotend

Postby Cozmicray » Tue Dec 31, 2013 5:31 pm

Well I received a J-Head hotend for Wally Chrome.
The bed will be about 30mm below nozzle at top bed position.
I don't have a slab of basalt to make up some of the height.
I think I am going to have to make an extender for the J-head.

Other builders without Ubis hotend BEWARE.

:?:
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Re: Wally Hotend

Postby owens-bill » Thu Jan 02, 2014 1:16 am

For what it's worth, there are different J-Heads too; Brian Reifsnyder at hotends.com only makes the Mark V version now, but the IV was longer and they're still being made by some cloners, so you will find designs that assume the extra length. This bit me with our OB1.4, and led to me modifying a completely different X carriage to use on it. There is no standard; the cartridge Ubis that I have loose right now is 75 mm top to bottom, the J-Head Mk V-BV is 51 mm and an Aluhotend that is sitting in the drawer waiting for a project is 58 mm. The shorted one I've heard of so far is the Chess ceramic hotend from 2engineers http://www.2engineers.com/shop/ceramic-hotend-chess-for-1-75mm-fillament/ which is only 45 mm long.
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Re: Wally Hotend

Postby Cozmicray » Mon Jan 06, 2014 11:19 pm

I had to remove brass fitting that captures the plastic bowden tube.
There is nothing to clamp tube to hotend now,
Seems nothing in wally parts to capture tube.

?Does UBIS hotend have a capture device?

How can I keep plastic bowden tube attached to hotend?

:?:
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Re: Wally Hotend

Postby Nicholas Seward » Mon Jan 06, 2014 11:39 pm

There is just a PTFE stub loose trapped between the hot end and the input tube that has a M4 nut threaded on it.
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Re: Wally Hotend

Postby Cozmicray » Tue Jan 07, 2014 12:41 am

Nick There is just a PTFE stub loose trapped between the hot end and the input tube that has a M4 nut threaded on it.


The diameter of a bowden tube is much greater than M4.
I can't vision how this works?
Tube threads into M4 threads?
Critical for bowden path thru the whole route?
and prevent any type of kinking.

:?:
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Re: Wally Hotend

Postby Nicholas Seward » Tue Jan 07, 2014 1:10 am

I use PTFE tubing that is 4mm OD and 2mm ID. I taper a end to thread it on a nut.
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