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Wiper Pad Testing
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Description

We would like to test various wiper pads to see if we can find a more robust and effective solution.

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karrad created this task.Jun 11 2018, 11:59 AM
karrad triaged this task as Normal priority.
karrad created this object with edit policy "LulzBot Hardware Products (Project)".

@anolen any updates? How are the double soaked wiper pads working? @coloradoprintingproject is wondering if we would like them double soaked for the next PO.

hey @kent Sorry I haven't been able to update you!
Double soaked wiper pads do last longer in the wiper mount and appear to maintain shape better, however the fibers still detach from the pad and attach to the nozzle pretty regularly. Another issue is after multiple uses the abs in the coating begins to harden and becomes more of a solid piece rather than a fibrous cleaning surface.
On the topic, we are discussing some alternate options here T3759. Any thoughts?

anolen added a comment.EditedNov 27 2018, 10:23 AM

Using the X2 ABS Coated Wiper Pad
Using Gcode ~150 prints worth of nozzle cleaning/wipes on the wiper pad at 170 C.

COPPER - NICKLE PLATED TEST

BEFORE

AFTER

HARDENED STEEL TEST

BEFORE

AFTER

I used this gcode:

Please see T2904 for #7447 Red Scrub Pad Data

This comment was removed by anolen.

WIPER PAD = #7446

COPPER NOZZLE
Before

After

HARDENED STEEL NOZZLE
Before

After

WIPER PAD = #7440

COPPER NOZZLE
Before

After

HARDENED STEEL NOZZLE

Before

After

WIPER PAD = #8447

COPPER NOZZLE

Before

After

HARDENED STEEL NOZZLE

Before

After

WIPER PAD = #7448

COPPER NOZZLE
Before

After

HARDENED STEEL NOZZLE
Before

After

I like these ones the best for what we need so I am testing them with some polydissolve wash to aid in the material sticking. Right now this wiper clears the nozzle tip great but it doesn't trap the material, just roles it to the back of the nozzle.

WIPER PAD = #7445

COPPER NOZZLE
Before


After


HARDENED STEEL NOZZLE
Before


After

*my tests are not using that ^^ much pad in the wiper mount so it isnt getting all torn up like the test did, just in case that was a worry for anyone*

kent added a comment.Dec 20 2018, 3:53 PM

I can't seem to find this on scotch-brite's website, but I use this non-abrasive type of scotch brite for cleaning engine blocks/heads because it doesn't scratch but still does a good job of getting stuck-on stuff off.

The other idea I came up with to prevent the fuzzies from breaking the probe is to use a hot knife to cut the wiper pad. It works pretty well to keep the ends of the wiring looms from fraying, and it seems to work pretty well to keep the strands in the pad together. Originally, I had been using an open flame to melt and fuse the fibers together, but that process isn't really recommended especially on something that gets treated with acetone which is flammable. Once the acetone dries it isn't really flamable any more, but it would only take one mistake to make for a really bad day.

tutley added a subscriber: tutley.Dec 21 2018, 7:12 AM

@kent @anolen I think a short strip of leather could work well for cleaning the nozzles, and would not be full of fuzzies.

@tutley where can I find a strip of leather that could be conditioned for this kind of use? I will test the suggested ideas the same as my other tests to compare.

@kent, Is this pad attached to a sponge?

kent added a comment.Dec 26 2018, 9:48 AM

@anolen yeah that looks like it, though I would want to get a manufacturer part number so that we could be sure what we are getting. I'm not sure if 3m makes more than one grade of non-scratch pads.

@anolen @kent I have some leather on order. I will get it to @anolen for testing as soon as I get it

anolen added a comment.Jan 4 2019, 9:23 AM

Leather Results from initial testing:

I do not recommend we use leather as the wiper pad source. While it doesn't wear the nozzle down, it does deposit debris. I suspect this is due to the nozzle heat while it is wiping accelerating the breakdown of the leather fibers.

I had to adjust the wipe depth slightly so it wouldn't push out the leather from the mount.

Before Wiper Test

After Wiper Test

@kent

Non-Scratch Results:
I used the original Wiper Pad Testing Gcode.

I would approve these for use as far as nozzle life goes. My one concern is that I am not sure what this pad is coated in, there is some kind of plasticy coating on the fibers. I have not seen evidence to suggest that this grips and holds material any better but I gave some to MER to try out. I would also like to run some temp tests to find out if these will melt or catch fire, until then, these are only approved for a wipe temp of 170 C.

Also note the particles on the nozzle in the AFTER pictures, didnt seem to be a huge issue, just thought I would point it out.

Before Wipe Test

After Wipe Test

kent added a comment.Jan 7 2019, 12:37 PM

@anolen Interesting, thanks for testing that. It looks a lot less worn out than the other types to my eye both the pad and the nozzle. It's not great the little blue flakes on the heaterblock, but it might be that is happening with other similar materials, it's just not as visible because the material is white or grey.

anolen added a comment.Jan 7 2019, 1:42 PM

SECOND TEST OF Non-Scratch Wiper Pad
This test was done with the pad placed into the wiper mount 'dome up', see picture.
NOTE: The Same Nozzle was used for both Non-Scratch Pad Tests.

Before:

After:

adam added a subscriber: adam.Jan 7 2019, 2:11 PM

Looks like it worked better the other way around. Can we do a quick test to see if it will grab material from the nozzle instead of smearing it all over the heater block?

anolen added a comment.Jan 7 2019, 2:50 PM

I have already put it on my quivers and am trying to determine its ability to grab material, I also gave some to MER, look for updates soon.