Mike Chaney's Tech Corner
July 22, 2018, 08:30:04 AM *
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 1 
 on: July 21, 2018, 10:40:44 PM 
Started by BruceW77 - Last post by BruceW77
Quote
there are three sponges in these carts and not two
Interesting that there are 3 sponges and not 2.  I guess it's easier to manufacture that way.

I was concerned that dry ink could get into the recovered ink.  From that point of view I would try recover as much as is reasonable in one attempt, rather that the strung out procedures I have used so far.  In fact I will probably throw the gray ink I have recovered from the current test cart.  After the first attempt at recovery I left the ink in the syringe overnight, with a normal needle inserted with the scabbard on.  The next day it was apparent that ink had leaked into both the scabbard and the hub between needle and syringe.  The syringe is a slip hub type, not the better luer lock hub type.  When I cleaned up the leaks and injected the remaining ink into a small bottle it felt like a clog had formed in the needle.  Which means it is very likely there is a small clump of ink in the collected ink.  So not worth the risk of reusing the ink.  I think the lesson is to recover and re-inject all in one session.
I think I may buy a better syringe though.

Bruce

 2 
 on: July 21, 2018, 10:57:02 AM 
Started by BruceW77 - Last post by admin
Another thought.  I wonder how much ink you could get out if you cut open the top of the cart and pushed the sponge out by pushing a screwdriver into the exit hole to push it up and out of the cart.  Then (using rubber gloves), take the sponge and squeeze/fold it just enough to get the sponge INTO the large syringe.  Then push down on the syringe plunger to squeeze ink out of the sponge and out the tip of the syringe into a container?  This would only be worth the efffort based on how easy it is to cut off the top of the cart and deal with the "raw" sponge, plus getting the empty sponge back out of the syringe when done.  But might be an interesting experiment.

OK... just tore open a cart to see.  Turns out you can grab the little tab at the end of the cart and roll back the top:



It breaks when you get to the sponge part but you can stick a screwdriver under the sponge lid and pop that up too:



After rolling back that piece, the THREE sponges just drop out (pushed them through with a screwdriver):



I put all three in a big syringe and crushed them.  Didn't even get a drop of ink.  But this cart has been sitting around for a year with the sponge hole exposed.  It probably evaporated:



Anyway, interesting to see that there are three sponges in these carts and not two:

- A little "puck" at the exit hole
- A rectangular piece above that
- A piece with a different density at the top

Mike

 3 
 on: July 21, 2018, 10:14:57 AM 
Started by BruceW77 - Last post by admin
You may have gotten as much out as you can.  If you look at a sponge under a microscope, you'll see that it is just a lattice similar to a loofah but on a smaller scale.  When the ink is more soaked (before you suck it out), liquid ink is likely taking up the spaces or "holes" in the sponge lattice and that's what you are sucking out.  As you pull ink out, you'll end up at a point where you've sucked all the liquid ink out of the gaps and what you end up with is a coating of ink that covers the small lattice spines themselves.  You won't be able to suck that coating off the lattice because it is held on by surface tension and the air you are sucking through will just move past it.  I wouldn't be surprised if there is 1g of ink volume just coating the sponge lattice.

On top of that, as you suck ink out, you are probably creating pockets of dried ink in the sponge.  That's another question entirely: is the ink you are extracting going to be "valid" ink?  Is it possible that as you suck ink out, you create microscopic dried chunks in parts of the sponge as air goes by, leaving those invisible microscopic chunks in the extracted ink if it breaks off in later pulls on the same cart.  If so, could they cause clogs or other problems?  That's my only worry with this method, so...

Most likely, giving the cart a few pulls over a minute or two gets most of the ink out.  Beyond that, you're looking at diminishing returns and the possibility of creating clumping problems with the extracted ink.

Just some random thoughts.

Mike

 4 
 on: July 21, 2018, 12:51:14 AM 
Started by BruceW77 - Last post by BruceW77
Quote
I'm thinking I could 3D print a cart-to-syringe adapter for this
That sounds interesting.  When I was researching the Purge units used in printers I found cases where home 3D printers had been used to make these types of pumps.

Further on my attempts to extract ink from an empty cart:
I tried gluing the shortened needle  to the plastic clip using the Bondic.  It uses UV light to cure the glue in about 4 seconds.  It did not work on this type of plastic, so I tried a hot glue gun and that did work.

After the previous test the cart weighed 15.12g without the sticky tape.
I removed the sticky tape covering the vent on the sponge side of the cart and pulled the syringe quickly to full length.  Nothing much happened, so I slowly closed the syringe and opened it quickly.  A small drop came out.  I repeated a further 4 times and weighed the cart.  It now weighed 14.77g without any sticky tape.

I then made a small homemade centrifuge by glueing a 1/4in bolt to a metal lid of a biscuit tin (about 8.5 inch or 21.5cm  diameter).  I taped the cart to the inner rim of the lid with the exit port facing out, put the bolt in a cordless drill and spun the cart for about 20s.  (No tape on sponge side vent).

I connected the cart back up with the extraction needle and repeated the previous method, but did it about 12 times.  The cart now weighs 14.6g, so ink extracted today is 15.12g 14.6g = 0.55g.  I have to say it looks very small in the syringe.  I dont know that the centrifuge achieved much.

The total ink now extracted is 17.84g 14.6g = 3.24g.  Which represents an increase of usable ink by 29.3%.  Ink left in the sponge is 14.6g 13.58g 1.02g.

My thoughts at this point are that a small pump would do a better (quicker) job, because its taken several goes to get this far.

I have extracted a purge unit from an old printer and may play around with it on some 3rd party carts.

Bruce

 5 
 on: July 20, 2018, 09:47:32 AM 
Started by BruceW77 - Last post by admin
OK, sounds good.  I wouldn't think bubbles would hurt anything.  They'd just dissipate in the syringe and you could tap it afterward and push the syringe up to get the air out.  I'm thinking I could 3D print a cart-to-syringe adapter for this.  Smiley

Mike

 6 
 on: July 19, 2018, 09:24:13 PM 
Started by BruceW77 - Last post by BruceW77
Quote
Why would you tape the pressure relief groove on the cart, causing a vacuum when you use the syringe?
Good question.  I meant to explain that earlier.  When I first took the cart out of the printer I taped the vent closed based on advise that if I ever intended using the cart in future for refilling, this stops the sponge drying out and rendering the cart unusable in future.  Although I think you can use rejuvenation fluid to bring it back to life, using the tape is the easiest option.

When I decided to try extracting ink, I decided to see what happens if I did it with the tape still in place.  If it did not work I could remove the tape and try again.
Seeing as it did work I never bothered trying it without the tape. When I tried drawing ink from the 3rd party cart there was no tape over the vent.  In that case there was a lot of air bubbles in the syringe.  In the taped off OEM case the bubbles tended not to form.

I will try to remove more ink out of the OEM cart with the tape off, but first want to glue the shortened syringe needle into the plastic clip.  Waiting for tomorrow, when ALDI have a special on Bondic Liquid Plastic Welder.

Bruce


 7 
 on: July 19, 2018, 03:07:18 PM 
Started by keller.ronald@gmail.com - Last post by Fred A
Quote
I seem to recall that in earlier versions there was an option to add multiple copies of the same photo to a page but I can no longer find it.
Is this not possible anymore?
Thanks.

Yes sir,
See attached screen snap. Go to the Prints tab, and check the lower right corner.
Fred

 8 
 on: July 19, 2018, 11:46:13 AM 
Started by BruceW77 - Last post by Jeff

In a previous post I said I did not think the Pro-100 would draw much power in standby mode.  I looked up the specs and it uses 2.1W in standby.  If your power company charged 4 cents per Kwh it would cost about 75 cents a year to leave the printer on permanently in standby.

Bruce

Here in the UK on our two part tariff is about twice USA costs

that would work out at about 1.84, if that saved any ink it would be well worth leaving switched on.

Jeff

 9 
 on: July 19, 2018, 11:42:00 AM 
Started by keller.ronald@gmail.com - Last post by keller.ronald@gmail.com
I seem to recall that in earlier versions there was an option to add multiple copies of the same photo to a page but I can no longer find it.
Is this not possible anymore?
Thanks.

 10 
 on: July 19, 2018, 10:26:40 AM 
Started by BruceW77 - Last post by admin
Curious... maybe I just don't understand...

Why would you tape the pressure relief groove on the cart, causing a vacuum when you use the syringe?  Why wouldn't you leave that open so air can enter the cart to replace the removed ink and the syringe can draw freely?

Mike

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