Hi. Very interesting - have been looking for alternatives too. Ordered a roll on eBay UK today.by Area5142 - Plastic Extruder Working Group
I treat the entire length of filament but not sure if it is necessary. Adhesion is the same as without oil - only tried extrusion on heated glass (tiles). The oil seems to stay in the extruder mostly seeking the colder parts of the assembly. I have an all metal extruder (stainless steel heat barrier) - when disassembling the extruder there is no buildup only liquid oil in the cold and semi hot paby Area5142 - Plastic Extruder Working Group
Had same problem using PLA. ABS worked fine but as son as I switched to PLA the extruder jammed after a few layers. Found a solution on the net (can't remember where...) - rub the PLA filament with motor oil before it enters the extruder. It worked for my RepStrap .by Area5142 - Plastic Extruder Working Group