Hello,
I am usiing using Cura 5.3 and have installed the Snapmaker Plug in 0.9. (But i can´t see this Plugin in the extensions menue).
My Problem: Printing first time with to materials (PVA and PLA). The Printzer starts with the first material. and dos not move to its parking position. The second head collids with the first head. What´s wrong?
did you load this Gcode into the flash drive and print through that or did you print through USB or wifi?
This has been a known issue for USB printing, i have not tried wifi yet.
I solved the Problem: I selected the wrong Printer in Cura.
I´ve the same issue with Prusa Slicer & Cura … using the correct printer-profile.
My extruder heads collide on the “Gameboy Patent Print” from nightfallvt
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I defined extruder left for a grey color and at a given layer height, J1 should print with extruder right in black. What happened was a collision, because extruder left didn´t go into parking position. It staid on the left edge from the model. That´s why extruder right started printing, but collided on the left side with extruder left.
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To avoid this, I defined simply a filament switch on the given layer and use only the extruder left. J1 printed, paused & clogged the extruder completely … so this didn´t work either.
I would find it super, to have a feature/button on temperature wheels “Parking Position” to force the extruder to go into parking position on it´s pad. AND: I would appreciate, when J1 will not forget the temperature setting of each extruder after removing a clog. I had a print with 20 clogs with silk filament and always to correct the temperature afterwards, because it was intially definded a bit too low in slicer
Is this printed with a USB connection to the printer through something like Pronterface ? If that’s the case, run the same code by putting it on the on board USB drive and it’ll work. Had the same problem for way too long
I guess that’s why also the filament runout sensor won’t work when printing via USB-connection (not USB-Stick!)
printing through the USB has heaps of issues and its honestly not worth it now that the wireless plugins exist for prusaslicer and its forks as well as cura.
@Miles @TylonHh Thx for your reply 
I print via USB-Stick, right. Not by using pronterface via USB-connection.
I´ll try wireless … nothing can make me happier, then simply getting my stuff to the J1 wirelessly.
My next concerns are that I have to run to the printer anyway, because after the latest firmware update it always indicates that the retraction values are not suitable (using Prusa Slicer … and to be honest, I´m not THAT DEEP into all it´s parameter settings actually). Used the profile recommended here for download as basic setup and fine tune it for my prints. And my next challenge are the clogging issues (jihah 
) especially with silky filaments or when using extruder 2 for supports.
In Cura I´ve no “retraction message” but also the clogging issues… and imho I cannot understand why J1 simply let´s you solve the issue, insted of temp. going down for both extruders, printbed going down all the way until extruders move from their pods and vice versa. But that´s another topic 
If i understood you: the printer bed go all the way down for homing. On the bottom is Z endstop
yes, that´s the J1 procedure
If filament loading not possible or clogging
then extruder 1 and extruder 2 go into parking, temp. goes down
and you go into menu > extruder > set temp again
and when temp is reached, menu says > Load or Unload
and you DO say > Load then J1 moves both extruders from their pods and printbed goes down completely
and you should open the ladge and push filament manually (or simply solve the problem)
My manual workaround to save time is:
I bent the pads down a bit, so that I see, if filament runs or not
and
If one extruder has a problem, I take care, that I have the right temp
open the ladge, pull of the PTFE tube & solve the problem
I click RESUME and let it go
One example: Yesterday I had a 4h print (using 2nd extruder for supports). Finally it became an 8h print, me staying all the time by the printer & do my manual workaround after every support layer. Obviously the reason is not clogging, simply retraction of extruder 2 is much too high and maybe a firmware setting that overrides slicer settings? ( extruder 1 without any issues)
I shortened even my workaround: always, when extruder 2 went to parking position, I directly opened the ladge, pull PTFE tube and push filament … and I was able to push filament down 2 thumbs wide each time! Thats 3-4 cm each time. And by doing this I had no issues any more and extruder 2 directly startet it´s printing job after extruder 1 was in parking.