Fischertechnik Basic Blocks

I downloaded the Sample Block
(With Side Holes and Knobs on both ends see Picture in the front between two
ft-LEGO Blocks)
The Original STL File was printed across , this is very bad.
On my FlashForge Dreamer i´m not happy with the Output.
The Holes are too small for Original Fischertechnik Parts.

I need a better one for LID-Spacer and FlexFlexRail

I changed the "BB60-3Holes.stl" deleted the knobs on both end
and then make a overlay do eliminated the Side Holes.

The two 70