So I have a small model (say 1" by 2" and half an inch high), which I’ve sliced with Cura to print in ABS, and need to print it over and over. After some tweaking, I can print them one after another with a fairly high rate of success. As the day warms up and cools down, I tend to adjust the z-offset to keep the bottom of the first layer looking good – close enough to avoid warping but not too close to get squished looking lines on the first layer. Generally the z-offset is somewhere in the 1.85-1.25 range.
In an effort to speed up my process, I’ve tried several times without success to print 2 or 3 of the model at the same time. For reasons unknown, the filament just doesn’t stick well on the first layer and ends up pulling the plastic around the bed and eventually makes a mess. I’ve tried increasing the flow rate on the first level and have cranked the z-offset down past 1.3, but nothing seems to make it stick. I can print one model at a time no problem, but two or more just seems to confound the machine. Suggestions? This is on a lulzbot 6 sliced with Cura 2.6.69 using the IC3D abs profile with minor tweaks.