calibration to concept models

It's very heartening watching print errors receding in size and significance as my experience grows. But the ones which remain become increasingly difficult to rout out.

I'm currently attempting to construct a simple 1:200 scale concept model of my architectural thesis. To overcome FFF limitations, my proposal will be printed in component parts for further assembly. Walls, floor plates, roof trusses etc. And to best employ FFF signature printing artifacts, such as the horizontal strata of successive layers, I am printing walls upright on the print bed, so the final part will suggest the successive layering of masonry construction. This is proving pretty ambitious.

One wall component. Given these are supposed to be concept models, I turned off fill in Skeinforge to save time and plastic. Unfortunately this aggravates an issue Woodsmoke has while beginning new layers. A layer is finished and the extruder retracts the filament to prevent oozing. The print head rises 0.4mm and the extruder returns to its previous position. A tiny delay occurs before the print head sets off around the new perimeter. The result is a splodge of plastic that interferes with subsequent laying down of new filament. Having moved beyond the splodge, new filament soon re-adheres to the previous layer. But without infill to assist with this re-adhesion, small errors will rapidly add up to a ruined print.

Would Oozebane solve this issue? Certainly the default settings produce no noticeable difference. Another artifact was recently under discussion on [reprap.org] forum. Small changes in the tension of printer belts can cause a noticable waivering in straight perimeter edges. Woodsmoke was exhibiting these symptoms on the Xaxis. I added bearing lubricant to the belt and upgraded the pulley from a reprapped part to a profi-printed part and the problem went away. At least on the Xaxis. This wall component was printed diagonally on the print bed. The waiver is back. Further investigation will establish whether this is X, Y or both axes at fault.

Woodsmoke