Daid's points #2 and #3 are absolutely correct from personal experience. however before adjusting bed height, consider whether you care about those bumps and how much you care..
the reason being, at the height you currently have (you probably used the tin foil levelling method?) you'll get really good first layer adhesion, actually it can be difficult to get ti off the bed when the print finishes, but change the first layer height to 0.1 or 0.2mm to reduce the 'bumps'.
if you lower the bed as I have now experimented with, you'll find getting the first layer to stick is way more difficult. in fact I've not successfully found a way to get the first layer to work unattended - it always requires me to fiddle with it a bit.
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Daid 306
Few things.
1) This is the first time I hear that support blames Cura for bad prints. Makes me kind of sad. I know they don't officially support it. But I didn't know they where going to play the blame game.
2) Your 2nd photos shows some signs of too little belt tension, you can see the infill is not connecting to the outline.
3) The bumps in the first layer you see in the 2nd photo are most likely caused by a bed which is set slightly to high at the start. The printer is extruding material for a 0.3mm layer (if you are using default settings), but if your bed is slightly higher then it is printing an excess amount of material. This excess material is pushed upwards.
4) 190C is very low. I almost never print below 210C. Most likely you are grinding your filament, or it's slipping because the amount of force required to print at 190C is very high. I highly recommend printing at 230C for starters.
5) Cura can run with the 115200 baudrate firmware found in RepG34, you need to change the baudrate in the preferences of Cura. And install the firmware from RepG34. You can also install custom firmware with:
http://daid.eu/~daid/marlin_build/
(The firmware in Cura is made with this builder)
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