3D Print Hub

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The Print Locker is for the explicit use of Princeton University School of Architecture students. Machines are free to use, 24-7, and are to be used in accordance to the following rules:


  1. Do not leave your prints unattended until a complete first layer has been deposited by the machine.Most errors occur in the first layer, this is to make sure your print is successful and you are not starting a bad print.
  2. Do not send prints with greater than 25% infill unless you have spoken with a monitor for special usage.
  3.  Be available to pick up your prints no later than 15 minutes after completion. Failure to pick up your prints may result in their removal by another  student, or monitor, and may cause unwanted damage. 
  4. Do not use more than one printer at a time.
  5. Write down the name of your file and your name on the print list associated with each printer. Check “done” when your print has finished. 
  6. The supplied material is the only free material. All other desired materials must be approved by the shop staff, in which a time slot will be established with you for explicit usage. 
  7. Make sure there is enough material for your full print. If there is not enough, ask a monitor to assist you with replacing the material.
  8. Wipe a small amount of pva glue from a glue stick down on the build plate before sending your print. Less is more, and this is generally accepted as the best method to keep prints down.


Failure to comply with the above policies may result in termination of your print. Multiple infractions may result in a removal of your privileges.




  1. If your print is not sticking down, or the first layer is uneven, manually level the bed using the provided calibration card. Go to System > Build plate > Manual leveling, and follow the prompts on the display.
  2. If your print is not sticking down, look at Rule 8, are you putting glue down? If not, you really should.
  3. Sending two prints in succession is faster than two prints side by side. Moving between two or more models in a single prints will take up time due to moving and retraction.
  4. Cura has a myriad of exciting options in how the printer operates. Investigate the website and software to find out more. Some options include “Spiralize Outer Contour” or “Adaptive Layer Height”



Please speak with the monitors if you have any questions. There are monitors directly in charge of these machines (see posted schedule) and they will be able to assist you. Additionally, many of the common errors or issues can be solved by looking up the problem online. Ultimaker especially has a fantastic website full of resources. If you’ve exhausted these options, please then come to the shop staff for help.