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Aus R2
#11
(03-09-2019, 01:19 AM)Cpocaus Wrote: Ok so... in an effort to keep my costs down (and to make some more progress)... I was wondering, can joint compound be used as a filler on PLA printed parts?
I have a whole bunch left over from some ceiling repair work I did last year and figured it would be much handier (and cheaper) to be able to use that to help smooth my parts.

My guess is no, and with the huge amount of effort and significant cost in building an R2 I wouldn't risk it.

If it doesn't bond well it might flake off and cause cracks in your paint. If you are going for a really heavily weathered droid you could possibly pull that off, but otherwise no.
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#12
(03-09-2019, 01:50 AM)Martyman Wrote:
(03-09-2019, 01:19 AM)Cpocaus Wrote: Ok so... in an effort to keep my costs down (and to make some more progress)... I was wondering, can joint compound be used as a filler on PLA printed parts?
I have a whole bunch left over from some ceiling repair work I did last year and figured it would be much handier (and cheaper) to be able to use that to help smooth my parts.

My guess is no, and with the huge amount of effort and significant cost in building an R2 I wouldn't risk it.

If it doesn't bond well it might flake off and cause cracks in your paint. If you are going for a really heavily weathered droid you could possibly pull that off, but otherwise no.

That sounds reasonable. I do have some misprints though... so I guess I could try on them and see how it goes. Otherwise I will just have to wait till I can afford to get some more filler.
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#13
Yeah, I gave myself the same sort of time frame, but the cost was not what slowed me down :-)

Had my dome all painted and went to fit to the body, and discovered there was a serious calibration error in my printer resulting in parts being a bit too small.
I ended up re-printing the whole dome with a different printer to get the diameter correct.
That combined with a hot summer, my build is still underway.
And what ever you do, don't drop the dome, or all the hard work you have done will need to be repaired, Learnt this the hard way.... :-(

Now that its starting to cool down a bit, I hope the get my dome finished being primed and painted.
Time is my biggest issue now, or rather the lack of time....

But I'm working with a the saying from another show, comic SiFi movie, "Never Give Up, Never Surrender"

On another note, if you have a 3D Pen, you can use that to fill in larger gaps, the PLA in the 3D Pen will bond well to other PLA, just use the tip of the 3D pen to heat/melt the base material before extruding out some filament to fill the gap, and use a spatula to smooth the top of the filled section while its still hot.
Work in a small area at a time.
Once cool again, you can then sand it down and you would never know there had been a gap there and it will be stronger after your effort as well.
I use the 3D Pen to weld the parts together, you can see how I do it here:
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#14
(03-09-2019, 03:23 AM)Cyber_One Wrote: Yeah, I gave myself the same sort of time frame, but the cost was not what slowed me down :-)

Had my dome all painted and went to fit to the body, and discovered there was a serious calibration error in my printer resulting in parts being a bit too small.
I ended up re-printing the whole dome with a different printer to get the diameter correct.
That combined with a hot summer, my build is still underway.
And what ever you do, don't drop the dome, or all the hard work you have done will need to be repaired,  Learnt this the hard way.... :-(

Now that its starting to cool down a bit, I hope the get my dome finished being primed and painted.
Time is my biggest issue now, or rather the lack of time....

But I'm working with a the saying from another show, comic SiFi movie, "Never Give Up, Never Surrender"

On another note, if you have a 3D Pen, you can use that to fill in larger gaps, the PLA in the 3D Pen will bond well to other PLA, just use the tip of the 3D pen to heat/melt the base material before extruding out some filament to fill the gap, and use a spatula to smooth the top of the filled section while its still hot.
Work in a small area at a time.
Once cool again, you can then sand it down and you would never know there had been a gap there and it will be stronger after your effort as well.
I use the 3D Pen to weld the parts together, you can see how I do it here:


That does make me wish I had a 3D pen... but alas... I do not.

Having said that... By Grabthar's Hammer... I shall get my dome looking.... acceptable.
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#15
I know you said you had a ight budget, but for less that AU$20:00 its well worth the investment, not only for the R2D2 build, but for other large projects you might tackle in the future, like BB8 or http://inmoov.fr/

you can see some of my build here
or check out one of our R2D2 builders YouTube channel https://www.youtube.com/channel/UCq3HiIt...szaiF5nnuw
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#16
(03-09-2019, 05:17 AM)Cyber_One Wrote: I know you said you had a ight budget, but for less that AU$20:00 its well worth the investment, not only for the R2D2 build, but for other large projects you might tackle in the future, like BB8 or http://inmoov.fr/

you can see some of my build here
or check out one of our R2D2 builders YouTube channel https://www.youtube.com/channel/UCq3HiIt...szaiF5nnuw

Where do you get them for under $20? I thought they were sitting around $60/80 or so? Could indeed be a worthy investment then.
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#17
I find them on E-Bay.
https://www.ebay.com.au/itm/3D-Stereosco...aYIUw3kQ3w
as one example.
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#18
Ok... so a bit of an update.

I don't think I really appreciated the whole "sand, filler, sand..." etc cycle until now.
I have my dome to a point that I'm willing (not sure if I can say happy... but willing) to let it be. I also realised that the earlier "brushed steel" tone I managed on one finish was due to the black filament showing through a little and the browny orange filler I was using... I kind of liked that look... but, oh well.
[Image: attachment.php?aid=1498]

I also had a day or so of searching for build logs to try and confirm placement of certain things (namely the holoprojector and it's related parts... ie the housing). I think I figured that out (I also noticed one of the directories even says X2... obviously missed that in all my excitement).
[Image: attachment.php?aid=1497]

So I figured I'd start getting the paint on the panels and greebles... well that was fun... that's when I realised what people are talking about when they say that certain things change multiple times throughout a movie... the holoprojectors and their mounts being a great example... depending on which scene the mount is either metalic, blue or black. The holoprojector itself either has a metalic end piece or a grey/black. I've gone for what I think is a reasonable combination... I'm also quite happy with how the black seems to be sitting at the moment... it's looking like a paint job that has worn off a little to reveal the metal underneath.
[Image: attachment.php?aid=1495]

Oh and I should say I have tested using a multi-purpose filler that was designed for patching plaster. It's very very easy to sand... seems to stick pretty well and easy enough to get a nice finish. I however did not work too hard getting a perfect finish on the pieces in the image and two things resulted from that.
The first, which is not great but not a huge issue (I may go back over it)... is the texture is a little grainy.
[Image: attachment.php?aid=1493]
The second is it has resulted in their being little "dents" in the surface... but given I did a base coat of Aluminium it has ended up looking like wear and tear damage and I may well leave them in... it will depend how they look with the other panels.
[Image: attachment.php?aid=1494]

So this is basically where I am up to for now... I need to get some more rolls of filament and I guess a lazy susan so I can figure out which version I need to use.

I'm also waiting on some electronic bits and pieces... not for final build elements (well they may get used there) but mostly to play around with as my electronics knowledge is a little more than zilch... but I'm determined to make R2 move, speak and hopefully... project Big Grin


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#19
So after printing the holoservo parts at .15 and seeing the difference it made, I printed one of the panel pieces at the same resolution and in a better orientation (ie standing up rather than lying down on the print bed)... the quality difference was such that I will now reprint all my panels and pie pieces as I'm confident I can get a much better finish on them.
[Image: attachment.php?aid=1502]

That didn't stop me from putting some of the pieces on the dome to see how they look (I think I need to go with a lighter blue... and a more chrome purple beneath).
[Image: attachment.php?aid=1501]
While I'm reprinting my parts I'm starting to gather some pieces for the electronics (of the dome at least). I want to do as much of it myself as possible so I am looking into instructions/ideas for doing the logic displays but will try and avoid buying ready made kits etc... I'm just stubborn like that. Having said that, I don't mind building them exactly the same way... I just want to do all the putting together myself... if that makes sense. Also if I do it myself I can buy it all in pieces and spread the cost out over a long time frame.

So while I'm at it... I know some of the pie plates open... but I'm not sure how many... I think I saw one image that looks like all but three (one obviously being the plate with the holoprojector). How many pie plates stay where they are? I'm wondering, because once they are done I can glue them in place which would be nice.

I also got my little "mp4" media player... only to find that it doesn't play MP4's but rather a much less commonly used .amv file (apparently used for anime video files typically). Finding a good converter to make my MP4's in amv's is tricky and thinking more about how to run it once R2 is together, means I may end up seeing if one of those LCD Pi screens or arduino LCD's can be used in the same way (which means being able to separate the LCD panel from it's backlight and put my own light behind it to then shine through in a projector style).

Huge learning curve ahead... but it should be fun Smile


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#20
Just a small tip, for the audio play back, you will want an MP3 player, MP4 is for video.
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