... deposition process means that any overhangs are unsupported. Test prints of arch-like components all show a degradation of the under-surface at the top of the arch, amounting to about 30 degrees of arc. For filament deposition printers (such as the Makerbot I use for the MERG kits) the effect of temperature can help overcome this. The two servo mount kits illustrated were printed at different temperatures. The higher temperature makes the filament (PLA in my case) less viscous and so it does not span the gap. 1547_100524_220000000.jpg undefined BTW it would help if the scale/gauge were mentioned in these posts. I'm assuming O gauge, but I could be wrong. Howard Watkins. posted: 10 Aug 2015 10:34 from: Martin Wynne Hi Paul, David Rayner uses the Shapeways service for his "Off The Rails" track parts in 7mm scale, see: http://www.shapeways.com/shops/otr topic 1503- message 9375 regards, Martin. posted: 10 Aug 2015 10:54 from: Martin Wynne Howard wrote: ...