Hi Daid, I think you got the "rounded square" thing, it's not much like a square but I think that may be the issue.
Is there any way than printing circles to see if it's an issue related to belt tensions??
I have printed 3 sets of tensioners but I need an advice on what to do with my current situation, please see below my experiments and results:
http://www.thingiverse.com/thing:19892
Good tensioner but doesn't work on the Y belts, it blocks between the top wood and the belt block...shame :(
http://www.thingiverse.com/thing:19818
Interesting design but difficult to regulate properly. Easy slides back during machine operation, creating random uneven tensions across the belts.
http://www.thingiverse.com/thing:10082
Basic design but clever, I'm currently using this one on all belts but I see that they have default uneven tensions. Any ideas? Can't put more than one per belt or it will prevent the axes from reaching the end-stops.
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Daid 306
If the axis are unaligned then you get an oval, but I've never seen anyone post any proof of this. I think the machine will jam before you get the axes unaligned enough for an oval.
However, more likely, is that you have a "rounded square". Which is caused by not having enough tension in the long belts. This causes some backlash effects which causes a circle to go a bit square. You can solve this with some printed belt tensioners (your first or printed object for your own printer!) viewtopic.php?f=19&t=604&p=3242&hilit=tension#p3242
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