print at 0.2 layers and 0.4 noozle. No support, no brim.
remove the axis build in support with plyers (pull it off)
put the lever, the horizontal spring in their place.
close the 2 shells by pressing them. You can re-open by inserting a screw driver between the parts, the design can bear it.
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The author remixed this model.
I liked the look of the original model, but the design was terrible (sorry loick3d):
So i completely redesigned the case:
Now it it ok for me. Wanhao PLA, that has more shrinkage than other brands (i suspect), so you might need to reduce your flow if too tight.
Enjoy