[Systems Engineering Teachers' Mailing List] Fwd: [esnet] UP! Printers and removal of print lines - another realSTEM activity

[Neville YOUNG]

Hi Everyone,
As the schools Health and Safety Rep I discussed this with our Lab Technician and these are his suggestions.


If the process was simply carried out on a bench in a classroom, yes, I would have HUGE problems with it.



If you carried out a complete risk assessment, my quick response would be that if the procedure was carried out in an operating fume cupboard with the doors closed, there shouldn't be an issue. Preferably with a semi-remotely operated process - turning on the acetone bath only after the fume cupboard was operating, and turning it off and waiting for the temperature to drop below the DG class temperature threshold before retrieving the work. It would have to be closely monitored during the process to make sure that the acetone didn't evaporate completely away.



This process would require both a documented risk assessment and a safe work procedure to be written.



With some simple risk minimisation I think it could be carried out safely.


Neville Young

________________________________
From: syseng-bounces at edulists.com.au [syseng-bounces at edulists.com.au] on behalf of David Fletcher [dgfletch at bigpond.net.au]
Sent: Thursday, 12 June 2014 4:37 PM
To: DESIGN & TECHNOLOGY TCHRS MAILING LIST
Cc: syseng at edulists.com.au
Subject: [Systems Engineering Teachers' Mailing List] Fwd: [esnet] UP! Printers and removal of print lines - another realSTEM activity



Sent from my iPad
David Fletcher


Begin forwarded message:

From: "Tony Pugatschew" <support at intellecta.net<mailto:support at intellecta.net>>
Date: 12 June 2014 1:59:40 PM AEST
To: "ESNET @ iiate" <esnet at iiate.asn.au<mailto:esnet at iiate.asn.au>>
Subject: [esnet] UP! Printers and removal of print lines - another realSTEM activity
Reply-To: "ESNET @ iiate" <esnet at iiate.asn.au<mailto:esnet at iiate.asn.au>>

Dear Esnetters,
Just a quick one to get amazing quality from your UP1 ABS 3D prints. Sometimes the print lines are objectionable and you want a gloss finish.
Rubbing with acetone is messy. I was at a school today and blown away by the following process.
Hang the part over a warm bath of acetone, The vapour does the job. Don’t use a flame but a water bath on a hot plate. I tried with an old beaker and it works a treat.
[cid:image001.png at 01CF8642.5CAD52A0]

Looks like there may be visits to the chem labs or maybe the kitchen!
Apparently there is an increase in strength also  ( OOP!s I can see a STEM activity – print 10 identical bars of material, Acetone treat 5, do a destructive bend test by adding mass to the end, plot the data and examine the errors, print a I beam and repeat the process, print a hollow beam with tubes to simulate bone structure), Remember a good STEM activity should have contributions from all the S, T, E and M.

Thanks
Tony Pugatschew


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