Recycling old 3D printed parts
I am Patrick.
I am a maker and 3D printer since 2012.
Not all 3D prints are working well or you have to print it again when you have missenineered something. I collected all my missprints since 2012 and now I want to recycle them. I bought a small hydraulic workshop press and an old oven and started to melt and mould the PLA Parts into Bowls.
My molds are a cheap stainless steel bowl set from ebay and they work great.
The only problem are the bubbles in the molten plastic. I have to find a way to get them out.
Thanks you for these tips.
I hope that my laser parts for the shredder arrive this week, so that I can granulate the parts and then dry it before melting.
I think most of the air bubbles come from the infill pattern in the printed parts.
maybe it is a good solution to heat up the printed parts to around 50 degrees Celsius for an hour or so to dry them before raising the temperature up to the melting point.
Here are some better pics of the bowls I made
@thegreenengineers, cool, I will try that this week, I have old printers to be shredded 🙂
2Hp at 30RPM should be more than enough to tear apart any 3d printed parts.
Since you have a shop press, you could make a sturdy container and try crushing the parts before heating them.
I hope you ordered the 32mm hexbar version. The PP shredder can already easily jam with thicker house hold waste already (2.5mm+). Waste like this may require 400 – 600 Nm range which results in a 3Kw+ 3phase motor and definitely wants a stronger axle.
Otherwise, a monthly exercise with the hammer may get it on specs 🙂
welcome to Precious Plastic. Great initiative, those came out not too bad 🙂
There are a few dozen things which can go wrong. I see in your setup the stock thickness and the temperature but also timing as biggest source for voids. Often also moisture is a problem. You could try next time :
– smaller pieces / granulate
– fully dried stock material (there are tips and products to contain and store filament). You could leave it also 1-2 hours in the dryer machine
– multi pass pressing (slow) : put it back in the oven and press a little more next
– different temperatures
– fill the upper part with concrete
Here are the first results
A few weeks ago I saw a Video on YT in which some resin castings are made.
They used a blowtorch to pop all bubbles on the surface after casting.
I tried the same after I melted the printed parts, just before I pressed it into the mold.
With success. All bubbles popped and I got a smooth surface.
After a little bit of cooling I filled the inner Bowl with boiling hot water to slow down the cooling process, because last time I got some small cracks on the surface.
I hope it will work.
I am very excited and I can´t wait to see how it comes out of the mold.
Yes, I saw this video. For this reason I wanted to built the same Shredder.
I ordered the same motor and I hope that is enough power for crushing the 3D printed parts.
Nope. I ordered the Parts for the 27mm hex bar version.
I hope that it will work with the slow 1,5KW 30rpm motor I ordered.
Otherwise I´ll sell it on eBay and built the stronger one 🙂
I´ll give s2019´s idea with the shop press crushing a try tomorrow.
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