Yeah, im doing 3DPRINTING SERVICE in Vietnam. And Thats typical situation. You have 2 options to follow:
1- Edit the wall thicness ( in 3d design soft)> 0,8mm
or
2-Change the manual nozzle's diameter ~0.35mm

cuz my English is not good, so I cant not explant more :/
if posible, I can slice it ( to Gcode file) for you, based on your 3dprinter and the favourite material!

By the way, This is my GPluschanel, add me into your circle if you find it useful <3 Dịch vụ máy in3D: https://plus.google.com/+Taomau3d-in3D-taomaunhanh