Thanks for your response. I can try your suggestions but I'm not sure they will solve my problem which is rooted in oozing. Currently, a lot of filament oozes before the print starts which means that the first bit of the print is short on filament. Worse, during the initial period before it gets to full extrusion it is extruding a bit, but often not enough to properly adhere,resulting in strings of filament dragging behind the extruder. Extruding somewhere away from the model would help but there would still be oozing during the move to the start point, which is exasperated by the large size of the Chiron build plate, and the problem with underextrusion resulting in unadhered strings would still be there.
Providing for Xmm of extrusion after moving to the starting point pretty much exactly solves the problem so it would be a nice feature to have, at least for non-ultimaker printers. But since that won't likely happen in the short term I'll try your suggestions, so thanks again.
The reason why you cannot select the prime blob is, that the prime blob is not generated by gcode. It is done by the firmware on newer Ultimaker printers and therefore only available there.
But you could do something on your own in the start gcode section of your printer profile. Just move the head the front, extrude some filament and that's it. I would recommend to raise the head 30-40 mm before extruding, so nothing can stick to nozzle.
Another procedure could be to extrude 1 or 2 lines at the front like the prusa printers.
Or just print a bigger skirt.
Which one you use doesn't matter, all of them extrudes some filament before the print. If you don't want to play with your start gcode, use a wider skirt, which you can configure in Cura directly.
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