And add pictures, pictures always help!
It might be best to begin with a model that is known to be OK.
Not many models on youmagine but quite a few on thingiverse:
http://www.thingiverse.com/search/page:7?q=auger&sa=
Note that helices are difficult to print without support as no matter how you orient them, there will be challenging overhangs. The only way to avoid the overhangs is to split the helix in half down it's axis. Like this model:
http://www.thingiverse.com/thing:605353
then assemble/glue the two halves together.
If you are asking for help modelling your prototype, you need to tell us what software you are using...
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IRobertI 521
This is completely impossible to answer without more information. What does the model look like? What does the print look like? What part of the print is not up to your expectations?
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