After two failed print jobs (overnight, hours and hours), I yanked the capricorn tubing from that side of my Sigma R16. I've modified mine to put the extruder motors on the top rear, rather than back inside wall. This eliminates the drag of a bowden tube from the spool to the extruder (pull drag). Even though I put stock PTFE tube in its place, the next print job failed as well. I'm using far-too-old PLA that cost me five dollars a kilo from Craigslist, so it may not be entirely the fault of the tubing, at least in my printer.

I'd love to have a remote direct drive system on my R16, but the Zesty Nimble folks only make 1.75 mm systems and don't reply to my email requests. I'm sure there are enough Sigma IDEX owners willing to spring for dual systems if one existed.