For anyone who downloaded these two collet racks, I'm going through the models and optimizing the internal geometry to minimize the amount of steep overhangs and number of supports needed.
The 3.0 version .STL models will (should) import into your slicer in the correct orientation to take advantage of the optimized geometry.
You should still let your slicer generate support structures, especially the R8 rack. Both should give much better results in the default orientation than the previous versions.
The ER20 rack shouldn't need much for supports, assuming 45 degrees as the overhang support threshold.
I'll have some free CAD time today. I think I'll modify these existing models to create versions that take all of the ER series collets, and maybe some for MT3 collets as well.
I wanted to keep the overall dimensions below 8.5" x 6". I did a few searches to determine the bed size for the more commonly owned 3d printers and it appears that once you get above 8x6, they become alot more expensive and fewer people own them.
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