3D printer supplies

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peterwaller
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Re: 3D printer supplies

Postby peterwaller » Mon Jan 02, 2017 10:16 am

With the new setup I was able to get the heads adjusted to the same height and now finally managed to print nylon supported by HIPS.
The nylon item lifted off the table leaving the HIPS support structure in place and a really smooth finish on the supported surface.
Image
This has proved to be quite a difficult task but enjoyable in its own way but now I can get back to building robots although there is still the ceramic heat break head to finish.

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peterwaller
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Re: 3D printer supplies

Postby peterwaller » Tue Jan 03, 2017 2:19 pm

May have been a bit premature with the celebrations I just tried printing a more representative test and it all went horribly wrong. :oops:
It appears that the all metal head keeps jamming on longer runs when printing PLA and HIPS but is fine with ABS and Nylon.
Also when the supported nylon part has holes and shaping it still fails to adhere to the HIPS enough to print properly.
I have reverted to the PTFE insert heat break tube for the support head as they are all below 245C and that seems to have fixed the first problem.
As to the second I am going to try some different support materials to see if they are any better.

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Shakey
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Re: 3D printer supplies

Postby Shakey » Tue Jan 03, 2017 2:34 pm

Yeah once I had an all metal hotend I stopped doing PLA for that reason. MUCH more prone to jamming than higher temp filaments.
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peterwaller
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Re: 3D printer supplies

Postby peterwaller » Tue Jan 03, 2017 3:43 pm

Thanks for the confirmation it always helps to know it is not just something that I am doing.

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peterwaller
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Re: 3D printer supplies

Postby peterwaller » Thu Jan 05, 2017 7:45 pm

Reading on the internet it appears supporting nylon is generally a problem as nylon doesn't stick to much other than itself.
I have tried using the same nylon as a support on the I3 but at the temperatures needed to give good inter layer bonding it is difficult to separate the model from the support.
To get the nylon to stick to the glass table I use a PVA glue stick so that suggested that nylon should stick to PVA plastic so I ordered a sample of Kai Parthy HIGH-T-LAY which is a PVA based water soluble support material. While waiting for that to arrive I thought I would try using a slightly different nylon as a support material. I had noticed that at lower temperatures the nylon loses its inter layer bonding so I ran with Taulman t-glase nylon as the support structure at 230 C and the Alloy 910 Nylon for the model at 260 C.
This actually worked quite well and I was able to separate the two parts reasonably easily.
The PVA material arrived today and that worked better giving a really good bond to the nylon and a good finish.
The dissolving in water wasn't as quick as I had hoped but after about 30 mins in fairly hot tap water it all softened enough to clean out quite well but longer soaking would probably be better.
Below you can see the two parts produced the one on the left being the one using nylon and the other the PVA.
Image
I think the PVA is the best option especially in hard to reach places but like the nylon the PVA is prone to moisture uptake and as the sample had been out of its sealed bag for some time there was a lot of moisture boiling off during the print process.
I stuck some of it in my oven for about an hour but seem to have over done it a little at it has gone a bit brittle so I I am leaving it out to see if it softens up a bit as it reabsorbs moisture.

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peterwaller
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Re: 3D printer supplies

Postby peterwaller » Fri Jan 13, 2017 11:38 am

The PVA plastic doesn't seem to softening up much so I have been looking for a better way to dry it out.
The problem is the oven I got is 100 C minimum so not really suitable but I have found a range of products that look much better.
Instead of searching for ovens I looked for dryers and found there are a range of fruit / food dehydrators that look ideal.
They are thermostatically controlled between 35 C and 70 C and mostly being round and a bout 30 cm diameter are ideal for lengths of filament taken off the spool.
I have ordered one of these and will let you know how I get on.
http://www.ebay.co.uk/itm/201363508426? ... EBIDX%3AIT
Some what unrelated but a real fun looking item is a 3D printer spool holder on thingiverse.
http://www.thingiverse.com/thing:1234760


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