Hi Marc, 

Part design may require different type of draft angles depending on : 

– Height of the wall to demold, 
– Texture applied on the wall, 
– Material to be used, 
and of course…what is acceptable on the final product. 

0.5° (per face) is minimum for height < 25 mm
1° (per face) is minimum for height <40 – 50 mm
1.5° may be needed for higher design.

regards ! 

Typically, a minimum draft angle of 0.5 degrees for core and 1 degree for cavity would work for ABS, but this can vary based on other design factors. The deeper or taller the part, the more draft is necessary. For every 25mm of depth, increasing the draft angle by 1 degree is a common rule of thumb to follow. The required surface finish of the moulded part also influences the draft angle. A rougher finish may require a greater draft angle to release cleanly from the mould.