[POM,ACETAL, DELRIN]

For one of our Research Projects we need to print in POM (polyoxymethylene), also known as ACETAL or DELRÍN.
We have a ULTIMAKER 3 Extended printer.
Till the date we have done some tests, with the build plate at 95-100º and the extrusor at 235º.
For the moment, we have not been able to solve the problem of adherence.
Now we are using adhesion sheets, with an irregular result. It is difficult that there are no bubbles when sticking it to the glass and the piece has even lifted part of the sheet. When we stick the sheet to the glass, bubbles appears between them, and the piece has even lifted up part of the piece, as a result of those bubbles.
We have had the idea of printing a small base with PLA and on top the rest of the piece with POM.
We are also considering to using a BUILDTAK, but we don´t know if automatic leveling will work correctly with it.
Can anyone share any experience about it?

[chemical resistance of the filaments]

I will ask the user if it is possible to share the model. Regarding the material we use Nylo and PVA from Ultimaker

[chemical resistance of the filaments]

17 hours ago, gr5 said:

I recommend you stick with nylon.  PVA works better with Nylon than many other materials.  Nylon is a fantastic material once you learn all the tricks.  I think instead you should concentrate on fixing the "warping" problems.  When you say "warping" do you mean the bottom layer is lifting at the corners?  If this is the only issue left then this is easily fixed.  Please show a photo of the issue you mean - your "warping" issue.

 

You use the blanked *during* printing.  Right?  You want the air temperature to reach about 35C.  If you have a temperature probe you can check the temperature of the inner side of the printer.

 

But this is only one of about 5 things you need to do for Nylon to stick well.  The quick version is: brim, rounded corners, squish extra well, very very thin liquid PLA on the glass, fan very low or off (3% max), clean all grease and dust off glass once per month and clean off soap also, cover front and top to get air to 35C.  I can elaborate on these after I know what you are already doing and what you mean by "warping".

 

Photographs please!

Thank you for your response and for the indications you give us. Part of them we already tested, and we had not thought about the fine thin layer of PLA that suggests us. We have adhesion sheets but we are afraid not to be able to detach them from the glass afterwards. I attach the photos requested.

This is our piece. Inside has a coil where a fluid is going to circulate.

Here you can see the warping at the base of the piece,  and we need the piece to be totally flat. In the final model we solved it by passing it through a milling machine, since the warping was small. But it is evident that it is not always possible to do this.

[chemical resistance of the filaments]

On ‎4‎/‎26‎/‎2018 at 7:57 AM, Dim3nsioneer said:

Unfortunately, Ultimaker could not provide specific information about chemical resistance (something like a list of acids etc.) until about two months ago. Maybe this has changed in the meantime.

For the PP it's pretty easy to find information just by Google. With Ultimaker Nylon and CPE/CPE+ it's more tricky as those materials are blends. So it would require information from the production partner.

 

I would recommend to get in touch with your Ultimaker reseller and ask for a few pieces of those materials so you can test it in your lab for your specific application. This is probably the safest way to find out if they are suitable for you or not.

Thanks for your reply. Now we are testing various materials in our laboratory. On the one hand filaments and on the other printed pieces, since we think that the chemical properties are evident that change after the printing process. We will report the results.

[chemical resistance of the filaments]

12 hours ago, kmanstudios said:

Covering the top with a thermal blanket seems like it would put undue pressure on the bowden tubes and create feed issues. Unless they are supported by some sort of structure; hanging or otherwise.

Thanks for your reply. The blanket we use is of negligible weight. It's made of aluminum, used by emergency teams and in the mountains

[chemical resistance of the filaments]

22 hours ago, SandervG said:

Hi @Pepa, thank you for your message and welcome to our community! 

Can you elaborate a bit on which organic solvents you want to use? Or will it vary a lot?

 

CPE and CPE+ are both chemically resistant. Have you considered any of these materials?

When you say you want to use other materials which are easier than Nylon, what is it about Nylon that you are having difficulties with?

Just warping? Do you use the active leveling? Do you have a clean build plate? Do you use Ultimaker Nylon or third party Nylon? 

 

Looking forward hearing from you!

Thanks for your reply. The Nylon we have used is from the ULTIMAKER brand. Our piece was a cell with an interior coil.
The printing lasted five days and was 100% filled
We print the same with Nylon and PVA, at the temperature of the printing plate and the extruder recommended by CURA.
We used automatic active leveling and the build plate was clean. Our printer is closed.
As we had problems with the warping, we reduced the speed of printing, turned off the ventilation and covered the printer with an emergency blanket used in the mountains to avoid fluctuations in temperature and humidity at night.
Preva to the impression we heat in stove in Nylon (to 60º, three minutes) and the PVA.
The result was acweptable but the piece was a size of 10x13x1.5 cm. It came out a little warped.
Regarding the solvents with which we have to work are preferably chloroform, ether, ethanol and acetone.
Just today we are testing the CPE. The CPE + is not valid because it does not support PVA. We hope you do not give us as many problems as Nylon.

[chemical resistance of the filaments]

We need to make some pieces for our laboratory that can be cleaned with organic solvents.
Where can I find truthful information about the resistance of the various filaments to these solvents?
The ideal would be in Nylon but we need to know if we can use other materials easier to print than Nylon.
We have printed on Nylon but it still gives us warping problems. We print it in the UM3Extended. It has a door and lid and we pre-dry the Nylon and the PVA in the stove at 60º.
During printing we cover the printer with a thermal blanket to avoid currents and temperature changes. Thanks in advance