//deltas are used to enlarge parts for bigger bearings
xy_delta = ((bushing_xy[1] <= 7.7) ? 0 : bushing_xy[1] - 7.7) * 0.9;
-z_delta = (bushing_z[1] <= 7.7) ? 0 : bushing_z[1] - 7.7;
+
+// fixme: this seems useless now but ... ?
+z_delta = 0; //(bushing_z[1] <= 7.7) ? 0 : bushing_z[1] - 7.7;
m3_nut_diameter_bigger = ((m3_nut_diameter / 2) / cos (180 / 6)) * 2;
+
+// deprecated
+i_am_box = (frame_type == frame_box);
+
+// shift smooth rod and leadscrew mounts simultaneously
+zaxis_delta_x = (frame_type == frame_alu) ? 5 : 0;
+zaxis_delta_y = (frame_type == frame_alu) ? -5 : 0;
+
+// shift motor/leadscrew mount to clear bearings and x-rods
+// X/Y ARE SWITCHED FROM X-END CONFIGURATION BE WARNED
+// BONUS FUN: X (Y in x-end configuration) IS INVERTED!
+// fixed, but it was all a fucking tautology in the end whoops
+zmotor_delta_x = ((frame_type == frame_alu) && (bushing_z[1] > 9)) ? 3 : 0;
+zmotor_delta_y = ((frame_type == frame_alu) && (bushing_xy[0] >= 5)) ? 5 : 0;