At the start of the print, the extruder will purge out some plastic. Are you making sure to remove that with a pair of tweezers before the print starts, otherwise that extra plastic will get dragged into the print. That's what it looks like in your photo - the blob is somewhere that the print head hasn't even gotten to yet, it seems.
I have seen a Cura bug that one person had, where the extruder just glooped out a ton of plastic for no reason at the start of the print... but I don't think that's what's happening here. Make sure you pull off the extra plastic at the start, and if you still have problems, I'll look at the gcode and see what it's doing.
Other thoughts on your photo and settings...
1) The blue tape should be laid better with no gaps. ideally use wider tape to get better adhesion
2) Your top/bottom thickness should be an exact multiple of your layer height, since it prints them using whole layers
3) Do you really need 0.08mm layers for this? That's quite thin, for what looks like a mechanical part. Also, in general, it's best for layers to be a whole number of motor steps high. On a UM1, 1 step = (3mm screw pitch/(200 steps/rev x 8 microsteps/step) = 0.001875mm. More practically, you can just use multiples of 0.03mm = 0.06, 0.09, 0.12 etc, or the points half way between those.
4) You should be able to print your first layer a lot faster than 20mm/s - at least 40. I generally use 75.
5) Do you really want 100% infill on this piece? Most prints can get away with a lot less.
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gr5 2,224
Something's wrong with "theeasypc.co.uk". Can only load a tiny piece of that photo. Please go to "gallery" (top left corner of this page). Then upload your picture there. Then start a new post and click "my media" next to the smiley face and insert your upload picture into a post.
I refreshed this page 9 times. I loaded a debugger. I just can't get the photo to load more than a little bit. It's still transferring now as I wrote this but nothing is happening.
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