more than one item on the print bed poor print quality

Im currently tuning my mendel i2 and getting closer to a good print.
Ive been printing the test objects and fine tuning the settings.
And getting better results daily.
Ive even printed a few bits to improve my printer like a filament guide and some bed screw adjuster thumb wheels.
All completed and useable.

One strange thing.
If i print 2 objects on the bed at once the print quality reduces drastically.
The thumb wheels would print fine singly but with 2 the filament was globbing up or not enough extruding.
Sorry should have taken pics but didnt.
Are there any settings or anything that needs tuning to improve printing more than one thing at a time?
I assume its something to do with travel or retraction.

Thanks

Gordon

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Gordon
Currently have a tweaked mendel prusa i2
About to build a P3Steel.
[scratchpad.thisandthose.org]

Printer for hire.
[www.3dhubs.com]

Member of South London Makerspace:
[southlondonmakerspace.org]

There is not much to do regarding this issue but to play with the orientation of your parts in the plate, the separation between them and the printing speed and retraction . Keep them close, try to print parts of closed to same hight and increase your retraction settings.

Thanks for the reply.
In the month since i posted this ive made progress with my printing.
It was really just down to getting everything tuned rather than just one thing.
Im getting there now.

Gordon