Modular Project Hail Mary Spacecraft - Detailed 3D Printable Display Model

🚀 Welcome aboard the Hail Mary!

This is my modular 3D-printable interpretation of the Hail Mary spacecraft from Andy Weir’s Project Hail Mary.

I designed the model as a collection of separate components rather than one giant print. This makes it much easier to print different sections in different colors, replace individual parts if something goes wrong, and assemble everything into a detailed display model.

The design includes recognizable features of the Hail Mary, including its distinctive spacecraft body, external structures, fuel-tank sections, radiators, and other details inspired by the descriptions in the book.

🧩 Modular Design

The spacecraft is split into multiple printable pieces so you can:

• Print sections separately

• Use different filament colors without an MMU

• Reprint damaged or failed pieces instead of the entire spacecraft

• Assemble the model more easily

• Paint or customize individual components

• Experiment with your own color scheme

Several pieces use alignment features/pegs to help with assembly.

🎨 Printing & Finishing

My display version was printed using a combination of black, white, gold, silver and blue filament, with additional painted details for areas such as the thermal radiators and windows.

You can keep the model completely printed, add filament changes, paint individual parts, or go completely overboard and turn it into a full display piece. 😎

Exact print settings can be adjusted depending on your printer and preferred level of detail. A smaller layer height is recommended if you want the finer spacecraft details to stand out.

I strongly recommend using a brim for the model if your printer doesn’t have strong bed adhesion or your printer is a bed slinger.

🔧 Assembly

Print the individual modules, test-fit everything first, and then assemble them into the complete spacecraft.

Expect loose tolerances - the joints include clearance to make assembly easier.

For a permanent display model, the sections can be glued together after confirming the fit.

Because the design is modular, you can also leave certain sections removable if you want to modify or replace them later.

🌌 Display

The finished Hail Mary makes a great:

• Desk model

• Bookshelf display

• Sci-fi collection piece

• Project Hail Mary fan model

• Space-themed classroom display

If you print one, I’d love to see your version — especially if you come up with a completely different color scheme or display setup!

🛰 Note from the creator
I really enjoyed printing and painting this project, and I hope you will too! Fun fact: I was finishing it at 2 a.m. for a festival display the next day. One of the largest parts failed after multiple color changes, which set me back quite a bit. Thankfully, I was able to split it into smaller modules in CAD and reprint only the affected pieces.