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May 2015
21 / 31
May 2015
May 2015
seangeraghty
May '15

Hi Guys,

I have had this file printed before but there were a few errors due to retraction settings etc. Would anyone be able to recommend the best way to get it printed? Or be able to print it for me? I have used a hub before for printing but it didn’t yield ideal results. Therefore I am asking what you would recommend.

Thanks,

Sean
thames2.stl (91.4 MB)

seangeraghty
May '15

Thanks for that! Yeah it really is rather complex. But our project was to design something that had to be 3D printed, hence the complexity :slight_smile:

Cinter
May '15

@seangeraghty can it be scaled? We have some suggestions for you.

1. Ask the masters @LOURIMI, if you are ok with it being smaller as they should be able to print it on their SLA machine.

2. We have contacts outside the network but still in London that print using SLS http://www.digits2widgets.com/ mention us as a referral.

In the meantime I’ll keep on thinking

Kindest regards,

Princess Charlotte

The Mayor’s office aka Cinter

3drus
May '15

Hi Sean, seams like it would be best to print it in SLA Plastic or Plaster Powder printers like our’s, Try our hub in NY and we will be happy to help you.

Cheers

Oren

gregh
May '15

Love this model!

On FDM I think the main issue would be support on the inside of the “bulb” near the top where it starts to become near horizontal. I think that you’d need to add a column up the middle and possibly branch out with some custom support. That is FDM.

All of those tiny holes might be another challenge, but I’d need to test a small section and see. It will certainly take a lot longer I think. What is the wall thickness of the main structure?

Also what particular challenges did you have last time with the other hub?

It’s useful to know which areas are critical in terms of finish. There is another obvious overhang but I assume that will be largely hidden when fitted in place.

Doing this on an SLS printer is probably going to get you the best results, but at a cost. What sort of delivery time do you have in mind?

Cheers,

Greg

seangeraghty
May '15

Hi Oren,

How much would that cost including shipping? As I am in the UK and on a reasonably tight budget (student project and all).

Cheers,

Sean

seangeraghty
May '15

Hi Greg,

Glad you love the model!

Basically it printed pretty darn well until around 98mm and was printed upside down for support purposes.

This however the fell over due to some retraction issues, as I am not au fait with printer settings etc. I couldn’t justifiably explain it.

Thanks,

Sean

3Dmigos
May '15

Good to ask… Before my hub was running, I got an stl printed for me (not via a hub) and I paid £40 for a rubbish print!!!

Wow, it’s nice. What scale do you want it? As mentioned below, the holes might be a bit of an issue, but it depends on the scale… With FFF, It might take a bit of time to make sure all the holes are clear afterwards.

Is it a light fitting? At 100%, that makes it 17.8cm tall? If you want, I’ll print the first 5cm or so tonight to see how the holes come out. (FFF).

Regards

Cris.

seangeraghty
May '15

Yeah I have thought about using the Form 1+ printer, however I need it to be this size for both aesthetic values and for the size of the bulb I am using.

Cheers

3Dmigos
May '15

Actually better to print upside down to minimise supports… I’ll print a bit and post a picture…

gregh
May '15

If printed upside down you will get the poor surface on the outside (FDM specific point), If you can get it printed the right way up, the overhang is hidden to some extent inside the bulb. Depends again where the finish is critical, that’s why Hubs will often ask so many awkward questions about your product :slight_smile:

seangeraghty
May '15

Ahh that’s why. Do you think a dissolvable support would be an option?

scalesandmodels
May '15

Hi Sean

I just had a look at that file on my objet and the way I would go around this one would be to print 2 halves which would come together afterwards.

If the pice is based on a total height of 180mm tall you are looking at a fairly expensive print due to the nature of the shape. It would need a lot of structural material. Saying that though I’m quite confident that I could make this print look pretty tidy.

If you have a peak at my hub’s images, I have printed fairly delicate shapes successfully before.

Let me know if you want any further advise.

Happy to help.

Ruben

ruben@scalesandmodels.co.uk

gregh
May '15

Yes, I think it may well be an option. I can’t do that myself though so can’t comment further. I was thinking more along the like of suppport that could be broken off and would look like a tree -possible in 2 halfs but it would probably take quite a lot of thought and maybe some experimentation to create that support in a way that it both works and can be removed and extracted afterwards. An interesting challenge

seangeraghty
May '15

The holes were alright, a bit stringy but that is probably to be expected.

It however failed at that height. Hence the questioning :slight_smile:

Impossible
May '15

Hi Sean,

I’ve just analysed your model for our Projet 3500 HD Max in blue acrylic and it’s possible to produce in one piece as designed but the cost is approx. £650 plus vat for XHD mode (0.016mm layer) or £425 plus vat for HD mode (0.032mm layer). If that’s within your budget, don’t hesitate to get in touch.

kind regards

Ian Carter

Impossible Creations

seangeraghty
May '15

Blimey! That’s a lot more expensive than I thought. Thanks for the quote but it’s well outside my budget. Sorry.

3Dmigos
May '15

Sean, ran it through my hub, came out at about £90 (fff), but there are student discounts you can apply: Student innovation grant 2020 | Hubs

I’ll print a sample this evening and post image. If it falls over while I’m printing, that’s my problem you will get a finished piece one way or another!!

The one you tried - how was the quality of the top bearing in mind it was printed upside down?

seangeraghty
May '15

The top was slightly scarred, due to it being printed on the bed and the external facade was therefore rough.

Thanks for giving it a go :slight_smile:

3Dmigos
May '15

Hi Sean,

Having problems with your STL, got a low-res print on the go now to see how it comes out. My build area is only 15cm high, so I re-scaled your balloon, leaving the screw thread the same size.

Here’s my suggestions so far:

  • You have a massive polygon count for a fairly simple shape - My computer kept crashing. Using Blender I have applied the ‘decimate’ modifier with a .3 setting to make it more manageable.
  • Because you have an enclosed shape, whichever way round it’s printed, there will be a lot of support material needed, this is expensive and best avoided. There is a ‘fashion’ in 3d printing to make everything support free - I think this is a bit of a fad, but certainly minimising supports is a great idea.
  • Your STL is non-manifold - that means there are gaps in the surface - specifically at the top of your balloon - the 8 sections come to a set of points, but they need to come to the same point.
  • I understand your brief is to design something that can only be 3dprinted… While your shape certainly fits this brief, here are some modification ideas to make the printing easier:
  1. Cut the shape into 8 sections that snap and glue together. One of the great benefits of 3Dprinting is the ability to print functional parts. Then the sections will print largely support free, much quicker, and you can mix and match colours.
    The whole piece at 15cm high will take about 13hours to print at low resolution, the separates can still be printed at the same time, but will be much quicker (about an hour each). Also, they can be bigger as many printers have a print area that is longer than taller.
  2. I assume this is a light cover - one of the great things you can achieve with 3dprinting is Lithoplanes (search Google images!). One of the reasons your STL is so complex and takes a long time to print is the holes… If instead of the holes, you varied the thickness of the walls, so the outside would be smooth, and when the light is switched on, the Thames reveals itself. This effect is definitely something for 3d printing and it will simplify your print and make it stronger (so it can be thinner) and quicker to print.
seangeraghty
May '15

Hey man, thanks for giving this a go. The ideas are great about Lithoplanes, however I have finalised this version of the design as it has now been handed in at university.

How would you suggest to separate the parts to “snap” them together.

Thanks again