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Aussie Sawppy

An antipodean sibling

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My teenage son and I are going to follow Roger Chen's path to a replica Curiosity. The intention is to look at implementing some variations along the way. We'll see how we go.

Firstly, a big hat-tip to @Roger for developing his original Sawppy in the glare of public domain (and taking the time to blog). Much goodness there.

https://hackaday.io/project/158208-sawppy-the-rover

Roger's work is a walk-up start on a project that would be far too complex for me to contemplate on a blank sheet basis.

  • Aussie Sawppy - Coupla 3D printing tips

    TeamSG07/06/2019 at 05:27 0 comments

    Sharing to perhaps save someone else some frustration...

    Firstly, our Cocoon Create Touch (Wanhao Duplicator i3 Plus) has manual bed levelling, which is fine. A minor hassle, but no big deal.

    We've found that using the preheating function on the machine well BEFORE we kick off with a print is a good move. Levelling the bed when it's at temperature is the go. 

    We've found it gives a more reliable start to the print. Previously, we've had random print fails on the first layer a few of times - extruder too close or too far away. I figure the aluminium build plate bends / twists a bit as it goes from ambient to operating temperature. We're only talking heat-related distortions of 0.1mm to affect things.

    Preheating for bed levelling may be common knowledge, but I haven't read that tip anywhere.

    Secondly, this morning we ran out of adjustment on one of the bed levelling nuts - something was amiss somewhere. A bit of investigating and we found that our x-axis gantry was out of level.  We're not sure if it has been a gradual change or from a single event. Checking the gantry level was a part of the initial set up of the machine, but of zero interest since. It was a long way out of whack.

    A quick check with a brickies string bubble level from the shed sorted it. We'll add that to the tool kit.

  • Aussie Sawppy - Deliveries

    TeamSG06/24/2019 at 11:41 0 comments

    It's not quite Xmas in July but the packages keep arriving :)

  • Aussie Sawppy ... is go!

    TeamSG06/22/2019 at 10:09 0 comments

    And we're away...

    Our initial purchase of printer filament included a roll of black PLA, so we've started to print the wheels - design gratefully downloaded from those @Roger has shared with the world at his GitHub repository (https://github.com/Roger-random).

    With the slicer set at 0.2mm layers, it's about a 15-hour print job - our longest to date.

    Set it to go late afternoon, print overnight and it's finished before everyone leaves for work / school. Shut doors in the house to keep the noise contained. Our printer isn't too noisy, but it's definitely loud enough to have you stirring in the night wondering what that sound is.

    No dramas with the first big print.

    Yep. That'd be some stringing you can see in there. My son intends to fiddle with the print settings to see if we can reduce it, but it's not that bad. Easily cleaned up with your fingers.

    Impressions

    #1: The 0.2mm layer height we chose is more than adequate. Could probably get away with 0.35mm. 

    #2: When I held it in my hand, the wheel was bigger than I thought it would be. I'd obviously seen the STL model and its nominal dimensions, but I still found it strikingly large.

    #3: There is more to the wheel design than I picked up from looking at it on a screen. Again, once you have it in your hand and push / poke / squeeze / twist,  the detail pops makes sense. Built-in suspension, both perpendicular to the axle around the axle! With the wheel being a single piece of plastic, there is obviously more springing than damping going on, but it's pretty impressive. Noice!

    Anyways, that's about it. We're off and running.

  • Aussie Sawppy - Parts Procurement

    TeamSG06/20/2019 at 11:17 0 comments

    @Roger 's budget for the original Sawppy was US$500. That's about AU$750 right at the moment.

    Given that I'm going to be paying a lot of postage, if we get in under AU$1000 I think that will be OK.

    The need for postage comes from living on the western edge of Australia - a long way from anywhere.

    I made a reasonably determined effort to try to get the parts required from local (Western Australian) suppliers, but I gave up the fight before too long. Another long story short: Too costly. Too limited. Just too hard.

    Even online ordering from Australian businesses on the east coast yielded roughly the same story. Ebay same. Amazon same.

    So... Hello, AliExpress! Everything you could possibly want, you just have to wait for it to arrive.

    Exhibit #1: Aluminium extrusions - Just couldn't get the right profile let alone the right dimensions in WA. About $4 per metre length from AliExpress (I got black anodised). AU$30 delivery for 5 x one metre lengths. Took just a week to get here.

    Exhibit #2: The servo motors. I'm sticking with Roger's recommendation on these because I don't know enough to argue. Found the right ones on Amazon US - AU$22 or something, plus shipping. BUT you can't buy third party items from Amazon US and ship to Oz. Got referred to Amazon Australia - same servo motors are now AU$25 plus shipping. And they only have four (I need ten). AliExpress? Some RC shop has a thousand on the shelf. AU$22 including shipping and you get a free debug board.

    So I sat down one night a couple of weeks back and ordered about AU$400 worth of parts on AliExpress. It's starting to arrive now :)


  • Aussie Sawppy - 3D Printer

    TeamSG06/19/2019 at 13:40 0 comments

    It drove me a bit nuts trying to choose an a 3D printer for our planned Sawppy adventure. Several weekend nights spent researching seemed to get me only marginally closer to actually picking a machine. I nearly pulled the trigger on a few occasions, but always found a reason to pause.

    I wanted to buy the machine locally rather than from a random overseas supplier - trading dollars for some certainty. A local warranty and local support seemed important given I knew slightly north of nothing about these things aside from what I'd read on the interwebs.

    Long story short: I stumbled upon a local company (well, Melbourne-based - 2500km away) selling a badge-engineered version of the Wanhao i3 Duplicator Plus. The "Cocoon Create Touch" is the machine. AU$500 at Aldi. AU$400 for a refurbished unit. Plenty of reviews on YouTube, if you're interested. 

    We've had it for about a month. Minor issues. A few foibles. Nothing bad worth mentioning, to be honest.

    Good things to mention are that it's proven reliable and more than able to print the miscellaneous thingiverse gadgets we tested it on. 

    In terms of price / capability, I think I found a machine good enough for the job.

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Mike Szczys wrote 07/02/2019 at 22:20 point

Love seeing another Sawppy build coming together!

  Are you sure? yes | no

Ken Yap wrote 06/23/2019 at 05:18 point

I think it should be christened Mad Max. 😜 But great work mate. 👍

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TeamSG wrote 06/23/2019 at 05:53 point

Haha... we're going yellow and black (for dramatic effect) so it'll be more like the mostly yellow Interceptor than the all black, 2-dr coupe Max made most famous.

We call it just 'the rover' or 'sawppy' at the moment.

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Roger wrote 06/20/2019 at 18:39 point

I love that my rover is getting a sibling down under. Sorry to hear parts are hard to come by. I had hoped Sawppy could be built worldwide, but there's more to building a world-friendly project than using millimeters. I welcome feedback from your Perth perspective on what is and isn't easy to procure. Especially if there are any "make this small change and my life becomes easier" insights.

Thank you for sharing your progress and best wishes on putting together your Sawppy variant!

  Are you sure? yes | no

TeamSG wrote 06/22/2019 at 05:15 point

Hi, Roger. I don't think you should be particularly concerned about how hard your recommended parts are to find. AliExpress is a great option regardless of where you are in the world. The wait for shipping is a tad annoying, but it does make you plan ahead, if nothing else :)

Broadly, it'd be nicer to be able to wander into a bricks & mortar shop and get what you need, but that experience is fast disappearing across the globe.

I'm often chasing reasonably obscure (though modern) auto parts. I gave up on local suppliers on that front years ago. Online shopping is always the the first stop for car parts now. The rover is in that boat, too.

So the Sawppy parts were only 'hard to come by' locally. In my experience, that's not saying much.

  Are you sure? yes | no

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