QU-BU Extruder Improvements

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Re: QU-BU Extruder Improvements

Postby bdring » Wed Dec 19, 2012 6:16 pm

I had the wrong bearing listed above (corrected). It is a 4x13x5 bearing. It is known often as a 624.

I wanted a bigger/wider bearing. A wider face is more tolerant to assembly variations. A bigger O.D. moves the center out further. The center boss on the motor limits the length of the screw if the center is too close.

My goal was to make the most robust design possible. I want printers of a wide quality range to be able to print it with reasonable success.

http://www.vxb.com/page/bearings/PROD/kit843

I will do a wiki entry soon to move all the information to one place.
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Re: QU-BU Extruder Improvements

Postby robotdad » Wed Dec 19, 2012 7:19 pm

Excellent, thanks. I should have some of those and some 623s by Friday Amazon willing. Amazingly they offered to get them to me today for 4 bucks. If I didn't have a few other irons in the fire I'd have taken that.
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Re: QU-BU Extruder Improvements

Postby robotdad » Wed Dec 19, 2012 7:53 pm

ah, and as to heatsink grease, just use cpu heatsink grease or is there something else I should be looking for there?

I'm not sure this brasso is going to b up to polishing the inside of the tube either, so looking at other polishing pastes on amazon now.
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Re: QU-BU Extruder Improvements

Postby orcinus » Wed Dec 19, 2012 8:59 pm

Drat, i've got 623's on order (based on the thingiverse version).
Oh well...
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Re: QU-BU Extruder Improvements

Postby bdring » Wed Dec 19, 2012 9:24 pm

I used heatsink grease on the block to the heatsink and the block to the motor. It either works great or you really don't need it because my block does not get hot enough to bother the upper filament.

I also slathered the cartridge with it before inserting it. It probably helps speed up the heating. The nozzles heats up super fast with a tiny bit (2-3 degree) of overshoot that settles flat within a few seconds.
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Re: QU-BU Extruder Improvements

Postby orcinus » Thu Dec 20, 2012 12:59 am

I was trying to decide whether to fire-cement the cartridges in, roll them in aluminium foil or slap a ton of thermal paste in there.
I guess thermal paste is the least intrusive option...
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Re: QU-BU Extruder Improvements

Postby bdring » Thu Dec 20, 2012 3:48 pm

I started a wiki page to consolidate all the latest info. I just started it, so there is quite a bit on knowledge to add. Let me know if you want anything added.

http://www.buildlog.net/wiki/doku.php?i ... provements
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Re: QU-BU Extruder Improvements

Postby TLHarrell » Thu Dec 20, 2012 4:56 pm

@ orcinus: your idea for aluminum foil sounds like the better way to go. I know from computer modding that the less thermal grease, the better. It's really designed to fill in the really small voids, and in larger quantities it behaves more like an insulator. Best method should me more like add a thin layer of thermal grease to the cartridge, wrap in aluminum foil to bring it up to a slip fit, apply another thin layer of thermal grease.
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Re: QU-BU Extruder Improvements

Postby bdring » Thu Dec 20, 2012 5:03 pm

Mine was a very tight fit and had to be forced a little so foil would never fit.
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Re: QU-BU Extruder Improvements

Postby orcinus » Fri Dec 21, 2012 1:40 am

Really? Interesting...
I could feed my cartridge to an elephant and then comfortably stuff *that* inside the hole in the heater block:

Image

FWIW, aluminium foil is how i've installed the wire-wound resistor in my Arcol.hu hotends.
In fact, the Arcol.hu instructions suggest that very method.

(those were a much much better fit, too)
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