Monday, May 19, 2008


Progress with ABS

I have developed peelable rafts and a reusable bed for ABS: -

That has enabled me to make these Darwin parts before my extruder broke again: -

Details here:


Wow, that looks really high quality? Have you consider making one of each individual part so you can do molding of the rest?
Utterly beautiful!
She's looking bloody good, mate.

Vik :v)
Incredible quality, Chris. Congratulations! :-)
No I think that kind of defeats the purpose. I strongly believe that anybody only needs to print three sets and soon everybody that wants one can have a set and do the same. I had a ginger beer plant when I was a young kid and soon learnt about 2^n replication.

Molding is fast but quite labour intensive. RepRap is slow but you can leave it going all day and come home to find a neat line of objects. My machine is smaller than Darwin but I can still make 3 corner blocks or 7 diagonal tie brackets at a time with big enough gaps between for the head to get in so they can be made one at a time in case of power cuts or break downs.
Amazing stuff! I can't wait for reprap to reach 2^n (even with N as months... it'sw very exciting!)


Reading some of your blog, it occurs to me that you might want to make yourself a DSC. They're quite simple in principle, and the only drawback to building a crude one is needing a larger sample to get comparable resolution.

It would help you in identifying polymers, and give you more data on specific heat, critical temperatures, etc.
Would that work identifying a polymer even if it had a filler material?
Oh, yes.

In the case of inorganic fillers, you'd most likely see a linear signal from the filler (chalk and titania and glass all lack phase transitions at such low temperatures), plus a nonlinear signal from the polymer.

For varieties of polystyrene (ABS, high-impact, hot glue...), you'd see a signal from the brittle PS phase, and a separate nonlinear signal from any rubber filler.

It should be fairly straightforward to fit these mixed curves with a program like LabPlot, to get a notion of relative quantities.
Just to clarify: When I say a separate signal, I mean a signal that can be separated mathematically, not one that will enter your computer by a different channel.
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