This is because some STL files are very large, and take time to upload. Like a big, snarled traffic jam, these transmissions sometimes get stuck in rush-hour traffic, which can happen at any moment on this global network. Sometimes companies place their networks behind firewalls, which limits what data can enter and leave the network. Be sure to have your system configured for http file transfers. In many cases your network administrators can help solve any problems pertaining to the firewall.
All data is transmitted over a secure connection.
Our secure servers handle the upload of your files, your account registrations, and your purchase order and credit card processing.