3DPCR

This 3DPCR document is designed to be the ultimate reference library for anyone building custom 3D printers, toolheads, or motion systems. Instead of hunting down dozens of obscure datasheets or downloading heavily detailed step files that crash your CAD software, everything here is built as lightweight "clearance models."

This is the standard workflow when you are putting together a full printer or toolhead in an Assembly tab.

• Step 1: In your own document, switch to the Assembly tab at the bottom of the screen.
• Step 2: Click the Insert button in the top left corner of the toolbar.
• Step 3: In the menu, click the Other documents tab. You can either paste the 3DPCR URL into the search bar, or simply search for "3DPCR" and hit Enter.
• Step 4: Click on the 3DPCR document when it appears. Note that Onshape's insert menu does not show standard folders. Instead, look for the carefully named Part Studios (e.g., "Electronics - Boards - Manta M8P" or "Motion - MGN Rails - MGN9c").
• Step 5: If the part is configurable, look at the top of the Insert menu before clicking the part. Use the Configuration Dropdowns to set your specific size (like swapping a 2510 to a 4020).
• Step 6: Click the 3D part in the list, click in your workspace to drop it, and hit the Green Checkmark to finish.

If you are designing a printed mount (like a fan duct or an electronics bracket) inside a Part Studio, you need the physical reference bodies in the same workspace to design around them. You do this using the Derived feature.

• Step 1: In your active Part Studio, click the Derived button on the main toolbar.
• Step 2: In the popup menu, click Other documents and search for "3DPCR" or paste the 3DPCR URL.
• Step 3: Navigate to the correct Part Studio (e.g., "Fans - Axial - Master Configuration").
• Step 4: Adjust the Configuration Dropdown at the top of the menu to match the part you are designing around.
• Step 5: Select the part from the list to pull the solid body into your workspace, and hit the Green Checkmark .

You can now sketch directly on the faces of the derived part, or use the Boolean tool to subtract its volume from your custom mounts for perfect clearances!

If you prefer to work in offline CAD software, you can easily pull files from this document. Because the parts are parametric, you will need to export the specific size you require.

How to Export a STEP File:

• 1. Open the public link and navigate to the Part Studio you need.
• 2. If the part is configurable (like the Axial Fans), use the drop-down menu in the top left to select your exact size.
• 3. Look at the bottom-left corner of your screen for the Parts folder.
• 4. Right-click the part name (e.g., "Fan - Axial - 4020") and select Export .
• 5. Choose "STEP" as your format and hit download!

The 3D printing space moves fast, and new hotends, extruders, and boards are released constantly. Building out the Hotend and Extruder sections takes a massive amount of time for one person, so community contributions are incredibly welcome!

Contribution Rules:

To keep the library legally clean and performant, any submitted models must adhere to two strict rules:

• Original Models Only: You must model the part yourself using reference dimensions or calipers. We absolutely cannot accept step files downloaded from other file-sharing sites (like Printables, MakerWorld, or GrabCAD) due to licensing restrictions.
• Keep it Simple (Clearance Bricks): Do not model internal gears, complex cooling fins, or PCB traces. The models must be "dumbed down" to their bare external dimensions, mounting holes, and critical clearances. Complex geometry crashes large assemblies!

This library is a living document, and there are big plans to expand it. Here is a look at what is currently on the roadmap to be added in future updates:

• Expanded Electronics: Adding more mainboards and SoC variants to cover an even wider range of custom builds.
• Printhead Components: A massive expansion of the hotend and extruder libraries (this is the most time-consuming part, so check the contribution section above if you want to help!).
• The Master Fastener Library: A complete, configurable suite of the hardware we use every day, including:
  • Metric bolts and nuts
  • Heat-set inserts
  • Various types of T-nuts for aluminum extrusions