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  1. #136
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    Oct 2007
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    The castings look good, I'm sure they'll machine up well. Let me know if you ever decide to do another run.

  2. #137
    Join Date
    Jun 2011
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    Australia east coast
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    71
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    Quote Originally Posted by Pete F View Post
    The castings look good, I'm sure they'll machine up well. Let me know if you ever decide to do another run.
    I have a few spares in this run if you want one.

    PDW

  3. #138
    Join Date
    Aug 2012
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    Australia
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    645

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    Quote Originally Posted by Pete F View Post
    The castings look good, I'm sure they'll machine up well.
    They machine beautifully. No porosity found when the outer crust was removed. I was running carbide inserts that were not for cast iron, not that it mattered.. They ended up remarkably square, despite my lack of care when machining. I plan to scrape them (I have 2 large, 2 small) in.

    IMG_5831.jpg IMG_5843.jpg IMG_5848.jpg IMG_5855.jpg IMG_5856.jpg IMG_5860.jpg

    Ok, ok, enough vanity shots!

    PS: The water brake is currently at the foundry...

  4. #139
    Join Date
    Aug 2008
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    near Rockhampton
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    Here is something I just printed up.

    It is a part for my printer that the extruder fits into (no I have not broken this part on mine yet). I did not draw it, the stl printing file is in the public domain.

    It has a bit of everything, bridges, overhangs. Holes for bolts and slots for square nuts and hex holes for hex nuts. It is a working part.


    The silver one is printed out of PLA which is a renewable plastic made from starch and cellulose. It is a low temperature plastic but prints very easily as proven by me doing it.

    The red one is made out of PETG plastic. Seems to be a relative newcomer on the plastic scene. I used locally made Aurarum filament. The diameter of the filament seems to vary +/- 0.05mm but the results seem good. PETG I have read is stronger then PLA and also is more resistant to slightly higher temperatures. It is a bit trickier to print. Took me five goes to get what you see done. I had trouble getting the first layer to stick. But it is apparently a lot easier to print then ABS plastic.

    PLA still seems to be the best to use unless you need special properties, in the case of this part temperature resistance as the hot extruder fits into it.

    20170301_211829.jpg 20170301_213927.jpg
    Gold, the colour of choice for the discerning person.

  5. #140
    Join Date
    Oct 2007
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    Sydney
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    Excellent looking prints, very nice indeed. Amazing to think you only built the printer a few days ago and can get prints like that.

    The prints can be re-worked after printing, so depending on that the failure is, you may be able to salvage something. You're obviously limited by shell thickness etc, but it's just plastic, so can be machined conventionally with sharp tools.

  6. #141
    Join Date
    Aug 2012
    Location
    Australia
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    645

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    Great looking prints R.C. It looks like your attention to detail is paying off big time.

    I have been experimenting with designing and printing a nylon "snap fit" connector to hold my DRO cables. This is my first nylon print. I noticed I was losing some detail with the .4mm nozzle, so I went down to a .25mm nozzle (another first for me). After my 15th iteration (changing print settings) I'm almost at an acceptable print quality. I have not dried the nylon, so the quality is always going to be sketchy. That said, the parts are strong with good layer adhesion, yet have a nice amount of flex. The part below is just a test piece for a DRO cable holder that I have designed. The little arm snaps into the T-slot to hold the cords in place. It works remarkably well in terms of the balance between flexibility and rigidity. I modified the part thickness a few times to get the right amount of flex. Note that despite the "arm" only being 3mm I can't break it free when snapped into the T-slot. It's surprisingly strong.

    The finished piece will hold all 3 cords in a neat way. The drawing is a first revision, that's slightly different to my print. The printed piece is just to test fit with one cable. It's one of the earlier lower resolution prints. I will post some more photos when I run some more prints tonight with the .25mm nozzle.

    snap_clips.jpg IMG_5902.jpg IMG_5911.jpg

  7. #142
    Join Date
    Aug 2008
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    near Rockhampton
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    Now Pete and Variant are going to have a bit of a laugh at this.

    My first print I designed, drew and sliced myself.

    It is a top for one of those five litre Willow square water containers. They tend to break off and go missing after a few years of rattling around in a ute.

    So I have drawn one up and printed it. It fits, but needs some hand fitting work. This is also printed in PLA and I will use PETG as it is food safe, although it also needs to be sealed.

    20170304_193227.jpg20170304_193143.jpg
    Gold, the colour of choice for the discerning person.

  8. #143
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    Oct 2007
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    Sydney
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    How waterproof is that print as it is? I've heard it's not very waterproof, but have never tried it.

  9. #144
    Join Date
    Aug 2008
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    near Rockhampton
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    I filled the PLA one with water and the next morning, there was no leakage.

    This morning, first thing I started the printer on this. It is a fan guard and holder combo. It is to cool the DC motor on my rotary table project that is taking forever to do.

    Printed in PLA. Made a few mistakes in the design and I could have jazzed it up a bit with rounded corners and such. It does not have to be as substantial as I made it. It was designed in Fusion 360 as two pieces, then joined together.

    Looks like the round window from Play School.

    20170306_104822.jpg20170306_104754.jpg
    Gold, the colour of choice for the discerning person.

  10. #145
    Join Date
    Aug 2008
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    near Rockhampton
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    I have designed and printed up a replacement part for my magnetic drill.

    Last year while doing some field repairs to a windmill I had to use the drill to drill some holes and a handle for the up down bit for the drill was in the road so I removed it. Then it went missing.

    So today I have drawn a replacement up and printed it. It has a M10 bolt the full length and a hex in the end for the head.

    It is similar to the originals, but the curves are slightly different.

    Took four goes to print. The first two failed due to computer errors where the full gcode for some reason was not transferred to the SD card which goes into the printer. The printer would start, then just stop ten minutes in as the gcode ended prematurely.

    The third attempt failed as the print came loose off the bed, so I changed the design to include a bigger base to hold it to the bed, which I removed later. It really should have been printed up the other way and that would have made a better transition from the round hole to the hex hole. it is all learning at this stage. Plastic used was PETG and I have sanded it with sandpaper to smooth it all off.

    It will work well when I get a proper sized bolt to install it.

    20170311_185006.jpg20170311_184355.jpg20170311_182450.jpg

    I am starting to feel now if you want to do bigger prints that do not have fine features, a bigger nozzle to put out more plastic would be better, just to speed things up. But bigger nozzles would be unsuitable for things like threads and such.
    Gold, the colour of choice for the discerning person.

  11. #146
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    Jan 2011
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    Far West Wimmera
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    63
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    Good thinking. The original handle will turn up any time now. Never fails.

    Dean

  12. #147
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    Sorry about the craptacular photo, but it is finished now, end plug and all.

    20170312_075622.jpg
    Gold, the colour of choice for the discerning person.

  13. #148
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    Jan 2011
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    Far West Wimmera
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    Aren't you taking this (light) red business too far?

    Dean

  14. #149
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    Oct 2007
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    Sydney
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    Something a wee bit different.


  15. #150
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    Aug 2008
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    I have only been watching a few of Tom Sanladerer's videos but I am surprised by how wide his knowledge is overall. A lot of these people on youtube, they know their stuff about the subject they are discussing, but outside that their ability wavers.

    Was surprised by the PETG smashing like that. As it did not break along the printing lines, it obviously prints well.
    Gold, the colour of choice for the discerning person.

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