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Strange spirals on Prints

Posted: Mon Jan 26, 2015 12:40 am
by SEBRET
So this is a little weird to me. I have been doing a bunch of prints for my new effector, but I'm getting a weird pattern in my prints.
It's not a layer shift because it isn't horizontal. it's like a nice even set of double helix that is off set by about .1-.2mm, just enough to be seen. Does anyone know what could cause this? It's not causing problems with the function of my prints, but i would still like to try and eliminate it. Crapy pics from phone

Max V2
Stock Hot End
SeeMeCNC Brown ABS
.5mm Nozzle
225c, Bed 55c

Re: Strange spirals on Prints

Posted: Mon Jan 26, 2015 1:35 am
by Generic Default
Those are probably caused by backlash shifting in the arms. There are essentially three overlapping circles in delta space, and they make three helices/circles when a linear wall is translated into delta space. Some confusing stuff! If your part is the right shape, there should be more than one overlap point.

Re: Strange spirals on Prints

Posted: Mon Jan 26, 2015 2:16 am
by SEBRET
Makes sense. Didn't really have my Trig hat on, but in hindsight it's a simple concept. I guess I can try throwing some bands on the arms till i get the Magarms up and running. Thanks