Threaded brass inserts can be a great way to add longevity to 3D printed enclosures that need to accept screws.


This tutorial will show you some of the best practices associated with installing threaded brass inserts into your 3D printed enclosures.


Working time will vary depending on your model and how many inserts you plan to install. The process shown took about 10 minutes from start to finish.



- Soldering Iron
- Threaded brass inserts with matching machine screws
- Washers
- Pliers
- Vise
- Heat resistant gloves
- Eye protection
- Respiratory mask



Step 1: Obtain Your Model


If you are designing your model to meet a specific need, remember to design the holes in your model slightly smaller than the inserts you plan to install. This will account for any plastic that melts when installing inserts. If you are adding inserts to a downloaded model, purchase your inserts with the hole diameter in mind.


This model is “Light Switch Box” designed by Thingiverse user qbasan.



Manufacturers of threaded brass inserts specify the hole size needed for the insert.


Step 2: Prepare & Print


When installing inserts, changing a few print settings in MakerBot Print can be a big help.


Increase the number of shells in your print. This will leave more plastic around inserts.


Once you have selected your settings you can print your object. We chose to print our model on the MakerBot Replicator+.



Step 3: Roughing


Supplies Used: Needlenose pliers


Once your model has been printed and removed from the build plate, remove any rafts or support material.



Step 4: Heat Soldering Iron


Supplies Used: Soldering Iron


Allow your soldering iron to heat for 3-5 minutes before installing inserts. This will ensure that you have to use the least amount of force to install inserts.


Step 5: Secure Print in Place


Supplies Used: Soldering Iron


Before installing your inserts, it’s also important that your model be secure. If your model moves during installation of an insert, you could damage the void or even the model itself.


We used a multi-axis vice that allowed us to work on the model from a few different angles.


Secure the model



Adjust the angle of the model


Step 6: Partially Install Inserts


Supplies Used: (continued use through Step 9) Multi-axis vice, soldering iron, threaded brass inserts, and pliers


Because PLA has a relatively low heat deflection temperature and can deform at moderate temperatures, it is important to install inserts gradually.


A: Grasp your insert with pliers
B: Position insert over hole


C: Press the insert half way into your print holding the soldering iron vertically
D: Move on to the next insert


Push lightly, your soldering iron should do most of the work for you


Step 7: Allow to Cool


As brass transfers temperature relatively quickly, your inserts should be cool within a minute or so.


Step 8: Completely Install Inserts


Once you’ve allowed your model to cool for a minute or so, install the inserts until they are flush with the top of your model.


When completing the installation of inserts be sure to avoid:


Installing too quickly

Pushing down on your inserts with too much force



Never attempt to hold inserts in place with your hand when installing. Always use pliers.


Step 9: Install Screws, Washers or Other Hardware


Supplies Used:

Screws & washers


Multi-axis vice

Thread in your screws using a screwdriver or drill.



Insert washers and screws


Insert additional hardware


Caution: Be sure not to over tighten. This can force the insert free from the surrounding plastic.


If you over tighten your screws, you may need to melt out your inserts and reinstall.


Final Part


Here is our final part. After installing inserts, screws, and washers, we added the final switches to this electrical enclosure.