Kris gives good advice.
ABS is quite prone to shrinking.
You could also try:
- Lower cooling fans / even turn them off (I think the default ABS profile is set to 50%; try with 0%).
- Redesign the model so that stress is minimized. Straight angles with thick parts will always be prone to warping and re-modeling relieve this stress might help.
Some good advice from nophead at item 11 and 12 in this link:
http://www.makerbot.com/blog/2011/06/23/12-ways-to-fight-warping-and-curling/
Also, what is the reason why you need to use ABS?
If it is because you need a higher heat tolerance, please consider other alternatives such as Colorfabb XT which is available in many colors, including black. It has a glass transition temperature of about 75 degrees Celsius and is also tougher than both PLA and ABS, but shrink about as little as PLA; significantly less than ABS.
This might be the easiest path actually if it meets your material requirements.
Good luck.
Daniel
Edited by Guest
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kris 29
In order to minimise warping to an acceptable level you need to do the following:
Minimise temperature gradients!
1. Hence increase build plate temp to 110C (only do so once the print has started, otherwise it will take forever to heat up.
2. Reduce print temp as low as possible without compromising strength
3. Most importantly; close the build volume so that heat cannot escape. You can do so preliminary with cardboard.
4. Brim is a must.
5. The provided glue stick is absolutely adequate.
Cheers
Kris
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