Workshop Hours

Summer Quarter has ended and UW is officially on break.  However, WOOF is still going.  We are going to continue holding our Friday hours until the beginning of Autumn quarter.  You should come in and take advantage of these hours as we cannot guarantee we will have access to our lovely room in the next school year.
We know there are still many of you out there with half-built Clonedels - We can help you finish them.

Summer Break Hours

When: Fridays 11am - 5pm

Room: ME 252  (mechanical engineering building)

We hope to see you there!

Room Open Today 8/17

Hey all,

Just a reminder today (Fri Aug 17) the WOOF room ME 252 is open at our general Friday hours 11am - 5pm

Come on down and see us.  We can provide help and support for your bot building!

WOOF Open Today 2-5pm

The WOOF room is open today from 2 - 5pm in ME 252

Tutorials and intensives are welcome.

If you need lots of help come in and we will get you up and running.

Shortened WOOF Hours This Week

Our regular Friday hours are shortened to 2pm - 5pm this week (8/10) due to member commitments.

Sorry to disappoint,
Beth

WOOF gets Vistors

So today WOOF got to host a mini-fieldtrip for the summer robotics camp kids.  They've been diligently making different kinds of robots all summer and came next door to check out our robots as their last hurrah of camp.

Brandon B set up the frostruder and demoed its ability to make tasty tasty cookie gears.
Brandon P showed the kids how Big Red can act like a giant over powered ink printer.
Beth showed them the boat and explained how 3D printers work using the boat's very visible layers of plastic as a visual.

All in all, a fun way to spend Friday afternoon and we at WOOF hope that we inspired at least some of them to keep pursuing STEM topics - especially 3D printing -

Brandon B explaining the Frostruder

Short Update

Workroom, ME 252, is now open Fridays 11 am - 5 pm for anyone who wants to come in and work on their printers. 

We are also working on a few ideas for new, large group projects, and will keep you updated as to what sorts of help we'll need from anyone who is interested.

I also wanted to share with you a 45 sec video of Matt crossing the finish line at the Derby for those who haven't seen it.

Video Courtesy of Lisa Weeks

One Week Hiatus

Hey all,

We appreciate all your support.  We had a great time this weekend.  However, we are exhausted so no workshops scheduled this week.  Keep checking back here though, this is where we'll let you all know what our next plans are.

Seafair and Pictures

Hey all,
We want to see those pictures and videos you took of WOOF at Seafair.  Sadly, we haven't set up a way to upload anything just yet if you aren't a WOOFer.  So feel free to e-mail me files or post as a comment a link to those beautiful images we know you have.

Also until I figure out a better place to collect all of our silly pictures on the website, while maintaining a sense of dignity, you can check out my pictures here:
http://www.flickr.com/photos/washuugenius/sets/72157630047944536/

Thanks again!
Beth
washuu@uw.edu

RACE DAY!

Come out and show your support.

We are across from the Radio Disney booth at Greenlake.  Our scheduled race time is 12:30 and again at 1:15.

Update

We did it and had a wonderful time at the Seafair Milk Carton Derby today.

After finishing 2nd  - photo by Alicia

We had some issues at the beginning as the Seafair crew didn't know how to categorize our very unique boat.  However, we worked things out and got to race in the Adult 14+ Racing category and placed an unofficial 2nd!  So way to go WOOF.

I want to thank everyone who came down to see us.  We had a ball.  I also want to personally thank our wonderful WOOF volunteers: Matt, Adam, Brandon B, Brandon P, Mark, Chris, and Morgan for coming down and helping show the public what WOOF is about.

Finally, Thank You Seafair.  We threw you a curveball and we appreciated you working with us and allowing us to go out and play and show the public a new form of recycling.  We hope to see you next year with an even better boat (and hopefully see some great competition in this new field)

~Beth

Seafair Milk Carton Derby

We did it!  We printed a full-sized boat on Big Red and it floats!  With our trusty President at the helm, we can't lose tomorrow.  Congratulations to you all for your hard work.  We really couldn't have done it without you. A special thanks to: Matt, Adam, Brandon B, Brandon P, Mark H, and Morgan for sucking it up and printing every night this week from 9pm until 6am.  WOOF thanks you guys for your hard hard work.

WOOF would also like to thank Scrapblasters for their assistance in reducing our milk jugs to something that we could actually get down a hopper.
They do fantastic work, check them out: http://scrapblasters.com/

Tomorrow, we show them all.

The Derby activities are based out of the area around the Seattle Canoe & Kayak Club (the stadium area) at the south end of Greenlake.  We are hoping to set up in a green space slightly to the Northwest of there.  We are going to have a small spot set up with our poster, the Wee WOOF (our test printed boat), and general information about WOOF.    Drop on by, we'd love to see you there.

Woofers,
Tomorrow please wear UW or 3D printing/Fabrication/Hacking related gear tomorrow.

Calling All WOOFers

Hey all,

We are on our last night of boat printing and NEED HELPERS.  So come on down, ASAP.  Adam, Matt, and myself (Beth) are in ME 252 now and will hopefully be printing soon.
You should come down and help out.  The boat is a thing of beauty.

~Beth

We've Begun

Following the success of Monday night's test print we only had one course of action: begin printing the boat. First we had to prepare for the print. We finalized boat dimensions, modeled the part in SolidWorks, countersunk hundreds of holes in the pegboard, and set up the build surface. We also decided to add a rheostat inline with the drill motor. This would give us the ability to control our extruder without reaching into the machine as it operated. Compared to our track record of hitting every wall imaginable it was a relatively uneventful afternoon.

Our freshly printed base with out test piece to show scale

During the mid-evening we generated stl files and sliced them. Because we were only going to get one shot at the print we needed to make sure the g-code was what it needed to be. After a dry run for final confirmation we broke for dinner. With our bellies filled we fastened the pegboard down and built a rheostat. We were ready to go.


Weeks ago we began joking about how our print would be super long, take a crew of people to make sure all was going well, and likely require working through the night. That joke is no longer a joke; it has become reality. Four of us operated the machine. We began printing at 11:00 pm and didn't finish the first layer until 3:15 am.

Adam, Matt, and Brandon stationed at their
posts making this whole thing work

Our process took a short while to evolve, but we found a great way to make the print turn out beautifully. We ran the printer at 30% speed. Adam sat at the end of the machine and controlled the rheostat so that too much HDPE was not extruded during turns. Brandon stood near the windows to replenish the hopper, screw down the pegboard if it began to buckle, and any other task that needed to be done. Matt and myself sat on either side of the printer and were responsible for "clean up". When the extruder would lay a bead next to a cooled bead it would not fuse to the old one. In more technical terms: the fresh bead did not have enough thermal energy to melt the cooled adjacent one so would not fuse. To overcome this we supplied energy with a heat gun to bring the old bead up to a fuseable temperature. The finished pattern looks great.













Check out these videos of the print:
Big Red minutes after beginning - http://youtu.be/Ts0X4a9Rnsc
Cleaning up the turns - http://youtu.be/MwFBBZEMYGk









We learned some valuable lessons during the print. For example, the pegboard will begin to buckle if it is not fastened down with enough screws. We either need to start with more or keep adding them on the fly like we were doing.






Another is how to make turns look beautiful. You can see in the image how some of the turns near the bottom aren't as nice as the later ones. Our clean up process was a little trial and error at first. Though there wasn't much error involved. At least not as much as we've come to expect.




The other big lesson was that we can control the printer manually if the g-code fails, but you end up with a really bad looking print. That's what happened at the tip of the boat in the picture to the right. Of course it didn't help that our HDPE supply had been interrupted by a kink in the feed hose which lead to some bubbles.



We left for the night (more accurately the morning) being exhausted. Exhausted, but elated. We successfully printed our base layer.  The last thing to do is print the walls. Our extruder is so loud that we need to do this sometime at night after the building is cleared. Even with the door closed the extruder can be heard in the mens room around the corner. Any pre-print tests should be done no earlier than 6 (to be courteous to the learning environment) and the actual print probably won't start until 9 at the earliest (because that's when parking is free). It will take several hours and requires a crew of at least 4 again (slightly different jobs but still as much labor as this print). If you'd like to be a part of this last stage get in touch with us and we'd be happy to put you to work. Email, comment, or just show up. We should be in the room after 10:45ish if you just want to drop by but if we're not it's because we are likely making a run to Scrap Blasters for more shredding. If you do lend a hand during the actual print respirators are optional (the fumes irritate some people, but we have decent ventilation). Hearing protection is strongly recommended.

Even if you can't offer several hours late in to the night feel free to come by and oggle if we're in the room. Thanks to everybody who's helped in any capacity at all. It's unlikely we'd be here without your contributions.

A thing of beauty

Next Stop: A BOAT!

This is it! Seafair is this Saturday. After yesterday I'm positive we will make it (if only just barely). Yesterday was a "roller coaster day". You know, one of those days filled with emotion: discouragement, hope, despair, and triumph. The best part is that it ended on the triumphant note.

Being unsatisfied with our test pieces up to this point the day started out with us in the process of reconfiguring our extruder. We were encountering problems with what we believe was a back pressure issue. Our paranoia about getting the HDPE to stick to the build surface caused us to mash down on the first layer which would lead to pressure building up in the tip with nowhere to go except backwards. I've lost count of how many times we've had to change that thing but it's near a dozen by now. The good news is I think we got it this time. Making changes to the auger and barrel seems to have made our extrusion reliable which has always been the goal (elusive as that goal has been).

Our new motor mount

The first tragedy of the day struck during a test of the new extruder when the z-axis motor coupling failed. It simply gave up. As disheartening as that was, we got rid of the old coupling assembly and built our own with some aluminum stock, a couple of hacksaws, and the hope that we could make it work. While the new design looks slapped together (it sorta is) it gives us access to the coupling if needed with the added bonus of being extremely quiet.

Using Brandon as a size reference

 With the machine now able to print something, we decided we needed to do a test print. Cubes, buckets, or anything else unboatlike were things of the past. We needed a quick small-scale test to prove to ourselves we could get the machine to do what it needed to do then move on to an actual boat. We pulled out some chalk and started drawing our what our final design would roughly look like. Who says sidewalk chalk is only for little kids?



We quickly modeled a small canoe, set up Big Red, plugged in three ventilation fans, ran a dry run, and prepped the surface. This was it: the moment of truth. Could we press go and let Big Red take over? The answer was no. Of course not. During our print of the base raft the extruder's drill motor began surging so Adam had to sit there with his finger on the trigger the entire time to deliver the appropriate amount of plastic while the computer operator tried to adjust the print speed on the fly. The sudden change in behavior of the drill motor was baffling. It was Adam though that suggested we reconfigure our extension cords so that the motor was not sharing an outlet with the ventilation fans. That did just the trick.

Our test when we finished

Without boring you with the nitty-gritty details, we tested a few variations of the G-code, layer thickness, and overall printing process. Looking at the layers tells a story of the individual lessons we learned as we were testing.

The fruit of our endeavors is a small-scale canoe which shows us that we can go large scale. What we will likely do during the big print is print the raft alone then feed the printer a separate set of G-code for the layers. 

The pretty side

This will be a long print and it will take constant baby-sitting. During our test we had Brandon on the computer, Adam working the extruder, and me cleaning up any slop/refilling the hopper. Theoretically one person could run the print but it should have at least two. This "automated system" is not automated in the least!

The less pretty side

Seafair is in 4 days. We have a verified process and about 70 pounds of HDPE. Stop on in sometime and check out what's going on. If you'd like to help during the printing process even better. Either catch up with us in MEB 252 or leave a reply to this post. We will utilize anyone who wants to lend a hand at this point.

I won't count my proverbial eggs before they hatch, but I think we got this. Let's show Seattle what UW students can accomplish in 2 months worth of free time and some recycled milk jugs.

Brandon thinking about his idea for "concrete skates". Just a little too small.

Multiple layers and warping solutions...

...Or, one step closer to being able to print a boat!

We've had a lot of issues with the HDPE not sticking to surfaces and peeling away, and a lot of ideas thrown around as a solution. On Wednesday, we tested printing on countersunk pegboard. The thought was that the plastic would get forced into the holes, and get mechanically anchored, thanks to the chamfer of the holes. We screwed the pegboard down to the print bed to try to minimize warping of the bed. Then the 5" test cube was loaded up, respirators put on, extruder and heating activated, and off we went!

To mash the plastic into the holes, we started off with a breakneck clip of 3 inches per minute. This spread our extruded layer out to nearly an inch thick. We modified our GCode to use a very sparse infill (we actually combined two different slicing configs) on the first layer to avoid unnecessary buildup.

Wonderful! Now up to the second layer and infill.

Looks good so far! And a pleasant surprise; HDPE bridges quite well naturally over gaps. But what about the perimeter? That's what everyone's going to see.

So maybe it's not the prettiest in the world, but at least it works, right?

Wrong. We had some issue with the extruder not being very consistent. It's visible both in the perimeter and the infill. But at least it's not a horrible flaw.

Hold on a second, that doesn't look like a cube! We ended up stopping the print here. This little square was almost exactly a thirty minute print. We'll have to try test printing shells of cubes. Solid shapes just take way too much time!

And, unfortunately, we got some warpage. The good news is that when we flipped the board over, the plastic had done exactly what we wanted and was anchored to the holes. We'd like to try printing with a raft included in the base layer, that way all the warping will happen to a part that is trimmed off.

Rumor has it that our layers are also starting to delaminate a little, but I haven't got any pictures of that so far.

Now for some numbers:

Feedrate = 30 in/min (100%)

Perimeter = 60-70% feedrate

Infill = 60-80% feedrate

Base = 10% feedrate

You may notice that these pictures are screenshotted from a video. I have the entire thirty minute print recorded, but I haven't uploaded it anywhere yet. If there is a huge demand for it I will put it up (It's a rather boring video, with a loud whirring sound the entire time), but otherwise we'll just put it in the archives, so to speak.

That's all for now! More updates as they come!

Printing 3D HDPE

We did it!  Today Big Red printed multiple layers in HDPE.  Great job everyone, you guys have worked so hard.  However, we still have obstacles to over come. 

In the mean time, for all of you who had to miss it, below are two videos and some pictures of the day's events.

Taping up the hopper to the extruder

Testing the HDPE extrusion before running a print

Beautiful!

Brandon watching Big Red go

Hot HDPE is some stinky stuff.  

Only our beloved President had an appropriate respirator for the gases.

Printing the 2nd Layer

Getting Close to Print Time

Here's the update on Big Red. We now have a working extruder. Thanks for the help Brandon B. The Z-axis motor coupler is no longer slipping. Thanks Adam. The print bed is almost finished. Thanks Mark H. The feeding tube is a fair way into development. Thanks Chris. The extended thermocouple is in place. Thanks Yuen. This is just to name a few.

Tomorrow we hope to begin test printing. We will also continue the development of the feeder tube, play around with anchoring the HDPE print surface to the print bed, get the PID temperature controller set up. Should be a good day. Starts at 11 am.

If you want to come in and work on your Clonedel you are welcome to do that too. The belts just got here today so if you want to come in and pick yours up you can do that too.

Smoothing out your prints.

So this post is a little unrelated to any Big Red stuff, but I mentioned it to Matt and he wanted me to throw this link up.

http://fabbaloo.com/blog/2012/5/15/a-very-smooth-idea-indeed.html

This would be an interesting thing to look into for a club project, or even for people to work on on their own.

ME 252 HOURS

Since we are going strong with big red, people are going to be in and out of the room most days of the week.  We understand set times are important for people so someone will be in ME 252 Tuesday, Wednesday, and Friday from 11-5.

You are free to come in these times to work on your printers or help out with big red. We will also keep our policy of "if the door is open come on in".  So there will still be work time outside of these hours but these are set and will occur every week.

We also want to have a day on the weekend to have the workshop open.  If you have a preference of Saturday or Sunday as a work day then comment on this post so your voice can be heard. 

Big Red: To Do

OK folks, we've been trucking along with Big Red these past few days and have finally hammered out a few more specifics of the "Big Red To Do"s.  Below is the list, as well as some more detailed info to hopefully get more people working on them without too much supervision.  (A basic list is also posted in ME 252)

Wire Routing

• We need something that collects all the cords (power to heater, thermal couple, 12 volt for motor) so that they won't get caught but still gives full range of z-axis freedom.  We're thinking we want something that will clamp to the top and bottom of the z-axis.
• The thermal couple (wire) needs to be extended.  Talk to Bill Kuykendall (ME Staff Engineer), he is the guy to go to for this.  We need a type K and as long a cord as we can manage.
• The 12 volt motor will also need a switch.
• All of the wires that connect to the extruder should have some sort of quick connect plug for easy removal.

• The dial that controls the heater needs a better mount than masking tape

• Over by where the wires on the x-axis come out, we need a place to set a: power strip, 12 V power supply, PID, and Relay
• OR we need to extend the thermal couple wire such that we can rest that stuff way out of the way where they can't get bumped

Barrel Rotation

Currently the copper extruder that we have on Big Red has issues of rotating.  What is happening: as the plastic heats up and gets pushed into the barrel by the auger, the plastic is sticking the auger to the barrel, which causes the auger to actually twist the barrel.  This is bad.  What we are thinking of as a fix:

• Tighten the copper barrel to the steel portion.  DO NOT break the copper.  The copper needs to be screwed in "snuggly" but not too tight or it could bust the brazing.
• Tighten the steel.  When tightening the steel, DO NOT grip the copper.

Both of these need done.

(Matt worked on this yesterday. The copper continues to rotate.)

HDPE

We still need your milk jugs!

• DO NOT bring in dirty jugs.  If they stink in the slightest way, we will NOT ACCEPT them.  Remember that we are guests in this room.
• De-label your jugs.  Best way to do this is with a hair dryer.  They have to be completely dry, but the heat from the dryer will cause the label to peal right off.  Extra emphasis on the labels being dry when you do this.  If they are wet, the glue will NOT come off.
• Remove the plastic ring.  Feel free the crush the end to get it off or snip it off with scissors.
• Only bring in DRY jugs

Design Build Platform

We will be posting more information about this later.

New Gears

Matt's got this covered.

PID

Matt also has this covered.

More SCRAPBLASTERS pics!