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Twisted Savonius

Posted: Sun Aug 03, 2014 2:56 pm
by Mac The Knife
After seeing how well SeeMeCNC's Dropcam worked, I had to have one,,,,, Here I'm printing the first of three sections of a Savonius style wind turbine. Been always wanting to make one,,,, and now I can, and still get my lawn mowed. No pencil or paper was wasted in the design of this, just good old seat of the pants engineering. And Solidworks.

Re: Twisted Savonius

Posted: Wed Aug 06, 2014 6:18 pm
by Mac The Knife
Currently printing the second of four sections of a larger diameter turbine, 8" diameter, by 4" tall. Repetier claims it will take 13 hours to print,,,,, add about 6 more hours to the total.

Re: Twisted Savonius

Posted: Tue Sep 02, 2014 9:59 pm
by Mac The Knife
Gone live again with another vertical turbine,,,

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 6:16 am
by Mac The Knife
Lack of bed adhesion, 5 percent infill, and "only infill where needed" not so good combination.

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 9:38 pm
by Mac The Knife
Trying again,,,, with black pla. PLA is evil. Long live ABS. .7 tip, .5 layer height, .75 layer width, and I started running an extrusion temperature of 200C, but every time the extruder kicked back, I would increase the temp 5C. It's currently printing at 270C.

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 10:22 pm
by DavidF
I love pla! LOL
270c. What hot end you running? It's rare for me to go over 180 with pla...

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 10:58 pm
by Mac The Knife
Semi-Stock hot end. The PLA is black from SeeMeCNC. When I say semi-stock, it has two 40 watt ceramic heaters, and a ceramic heat break instead of the PEEK. I'm still getting some kickback on the extruder drive. But like I stated earlier, I started at 200C, and worked my way up 5C at a time.

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 11:00 pm
by Mac The Knife
270C displayed, I've determined with a thermocouple that the actual temperature is 8% lower then that.

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 11:38 pm
by DavidF
still though, thats really really hot for pla. I think I would be looking for something somewhere....

Re: Twisted Savonius

Posted: Wed Sep 03, 2014 11:45 pm
by Polygonhell
Do you still have a Teflon liner in the Hotend?
If not, it's probably jamming.

Increasing the temperature increases the size of the transition zone, which might let you get away with it if you get hot enough, because PLA drops in viscocity as temperature increases. But at some point you're going to burn the plastic.

As an aside I haven't bought any recently but the PLA I bought from see me was about on par with thee cheap Chinese crap I won't buy.

Re: Twisted Savonius

Posted: Thu Sep 04, 2014 12:42 am
by nitewatchman
Polygonhell wrote:As an aside I haven't bought any recently but the PLA I bought from see me was about on par with thee cheap Chinese crap I won't buy.


Was kinda my experience also, it seemed to have a lot of filler in it.

Re: Twisted Savonius

Posted: Thu Sep 04, 2014 6:14 am
by Mac The Knife
Polygonhell wrote:Do you still have a Teflon liner in the Hotend?
If not, it's probably jamming.

Increasing the temperature increases the size of the transition zone, which might let you get away with it if you get hot enough, because PLA drops in viscocity as temperature increases. But at some point you're going to burn the plastic.

As an aside I haven't bought any recently but the PLA I bought from see me was about on par with thee cheap Chinese crap I won't buy.

I'm still running the liner. It does soften at 275C but i haven't had it cause a failure yet. It does deform, the piece that was in the hotend when the nylon jam occurred has a smaller ID, and only the 1.65 line will go through it easily, not the 1.75 filament.