It'd certainly be a lot better if you could put support and infill layers on divisions of normal layer height as well as multiples, if you're using half mm layer heights sometimes you only want the seperation to be a half or quarter layer, same for structural infill with alternating patterns, it'd b...

Great, unfortunately tolerances won't allow more overlap for this atm - the parts have to come out with less than a tenth of a mm size-wise to keep them on spec through temperature changes, so I'll have do a little jiggling with the sizes first. I do have some more parts that show the same single in...

I can send one in, but I can't post it here publically as the model is commerical.

Eh? It's a single extrusion that's causing the gap, you can see it's the correct width in half the points and not in others. Works fine on other layers: S3dBug.jpg I'm not sure if it's just a rendering bug but it does seem to coincide with the models that have some issues with single extrusion fills.

Been trying to work out why my machine was having some issues with extruding single lines - I thought it was the extruder so stripped the machined and cleaned everything, etc, still had the issue with single extrusions being underextruded and not meeting the perimeters - couldn't work it out out, bu...

I have no issues with paying towards continuing development so long as we get a year or two of free updates between - provided that work continues on quashing bugs and issues with 4.1, etc, as they're going to end up supporting multiple versions.

This file crashes the program once every 10-20 tries - it also has massive problems with random retractions and overlapping perimeters in the first section - what on earth is going on there?! I've been having a lot of problems printing TPU since switching to 4.1.1 and I'm wondering if this is part o...

It could be scripted I'd imagine yes, there's a good reason it's not default though - because for many printers and prints it would knock the print off the bed with the nozzle or x-axis arms.

A checkbox for it would be nice, there are some hollow, thin wall items I make where the new behaviour is much better for the object/print for me.

I've definately noticed it, as it causes me the same issue as the OP - if you have models that rely on the infill patterns being set you can only print them in singles, especially if you're tuning infill for stiffness in flexibles.