I'm not a boffin at shell stuff, so I amy have messed up.
This is what I got:
G-MBP:LaserParts graham$ ls
Atlas3d.sh left_frame_section_3-2.stl
F9GZSUMI5MD0Q20.stl left_frame_section_3.stl
FC85TRAI5MD0Q21.stl left_laser_arm.stl
FRINO86I5MD0Q22.stl left_laser_holder.stl
camera_arm.stl right_frame_section_3-2.stl
camera_bracket.stl right_frame_section_3.stl
camera_bracket_no_support.stl right_laser_arm.stl
camera_case_back.stl right_laser_holder.stl
camera_case_front.stl rpi_cable_carrier.stl
camera_shaft.stl rpi_case_bplus_lower.stl
camera_tower.stl rpi_case_bplus_upper.stl
camera_tower_front_plate.stl table_coupler.stl
cross_bar.stl turn_table_d4.stl
frame_connector.stl turn_table_d5p5.stl
frame_section_2.stl turn_table_d7p5.stl
G-MBP:LaserParts graham$ sudo ./Atlas3d
WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort.
Password:
sudo: ./Atlas3d: command not found
G-MBP:LaserParts graham$ sudo ./Atlas3d.sh
--2015-03-25 15:53:51-- https://s3.amazonaws.com/atlas3d/
Resolving s3.amazonaws.com... 54.231.244.8
Connecting to s3.amazonaws.com|54.231.244.8|:443... connected.
HTTP request sent, awaiting response... 403 Forbidden
2015-03-25 15:53:52 ERROR 403: Forbidden.
grep: printables.html: No such file or directory
G-MBP:LaserParts graham$