fixed part for tronxy-base-v2 nonsintetic

update: This is no longer needed the upstream thing has been fixed.

part #1 of https://www.thingiverse.com/thing:2354771/#comments seemed to be missing the "dowels" on the left side in order to function.

I manually modified the STL using Sketchup.
update: This is no longer needed, the upstream thing is fixed.

(see comments https://www.thingiverse.com/thing:2354771/#comments)

this is meant to only be a temporary fix until nonsenttic I can get back to us.

update: modifed part #1 instead of part #2 to have the dowels. matches the current picture of all the parts .

update: my stl edit skills left bad triangles that flipped out slic3r. better edit this time. version f3