MARK ONE/TWO -- Filaments other than Nylon?

Hi everybody,
i am using Mark One Printer. Materials are restricted to Nylon and fibre reinforced Nylon.
Due to inaccessibility of all process parameters, as nozzle temperature, Speed, retract speed etc., it is very difficult to use other types of material as PC, ABS …
Actually i tried PC-Filament 1,75mm, which seems to be suitable, but with the difficulty to stick first 5 layers to the unheated bed. Especially, when using support geometry, i have Problems.

Does any of the Mark One users also tried alternate materials? Anybody using PC? How sticking to the bed?
Is there anybody, who could “decode” the Mark Forged G-code?

Looking forward to hopefully many answers

Thomas from Augsburg / Germany