Geeetech

You could maybe use a heat gun in addition to heating the nozzle.

Sounds bad to me. Maybe it's not PLA that's stuck there?

You are right, the correct answer is in the Start GCODE.

You must remove the 33s or your prints will always mix.

Just copy the start and end GCode from Cura. I don't see what else is a big difference.

Did you figure this out?

I would look into your start Gcode instructions.

Also you can just put the clips on the front and back, not on the sides.

I also heard of auto-leveling which keeps a terrain-style record of your bed, to adjust for variations. However your print will probably take on the bed shape.

My A20T also has this same problem. Since I'm printing small objects, I level near the middle of the bed and print there, and ignore levelling the edge corners. Was thinking of getting a glass plate, that should help? Maybe some heat-resistant mactac to level it underneath? Another option is getting...

I discovered the answer in another post:

Remove:
M163 S0 P0.33
M163 S1 P0.33
M163 S2 P0.33
From Start GCode

Hi!

Just got a Geeetech A20T and am excited trying it out!

But I want to print solid colors and no mixing. When I print I see it changing to 33%/33%/33%. I'm using Cura 4.11.0 with the settings profile for A20T built in.

What's the best way to print only 100% pure colors?