CORE One / CORE One L Z-Motor Mount with Heat Set Inserts

This is a remix of the Z-motor mount for the Prusa CORE One 🥰. The key improvement is the addition of heat set threaded inserts in place of the original design that required the M3 bolts to thread directly into the printed plastic.

Key Features:

• Heat Set Inserts: Eliminates the risk of stripping threads when mounting to the base plate

• Reliable Installation: Risk-free initial mounting process

• Maintenance-Friendly: Easy and safe remounting during printer maintenance

• Enhanced Durability: Heat set inserts provide stronger, more reliable connections than plastic threads

• Drop-in Replacement: Compatible with existing CORE One assembly process

Assembly

Post Processing

• Remove all support material and inspect the print quality

• Gently sand the top surface using sandpaper on a flat surface to ensure the mount sits perfectly flat against the base plate when doing the final assembly

• Install the heat set inserts , ensuring they are completely seated (refer to included images)

Threading Preparation:

The M3 screw hole is intentionally slightly undersized to create a secure thread that prevents loosening over time. To achieve the perfect fit:

1. Insert an M3 x 8mm screw from the underside, threading it all the way through

2. This creates a perfectly aligned thread in the plastic that matches the heat set insert

3. Remove the screw and mount the motor to the mount

Final Assembly:

1. When mounting the unit to the base plate, ensure the M3 screw aligns with the thread created in the plastic

2. For added security, consider using blue thread locker (Loctite) if desired

Note: The undersized hole design provides mechanical thread locking, but the fit will  of course depend on your printer/filament settings. For added security, consider using blue thread locker (Loctite).

Print Settings

• Filament: PC (… and one 25g sample of Prusament PC Blend is all you need for the 3 mounts)

• Layer Height: 0.2

• Extrusion Width: 0.4

• Perimeters: 4

• Top / Bottom Layers: 5

• Infill: 60 %

• Support: Recommended (see instructions below)

CAD

This model has been completely reverse-engineered from the original Prusa design, allowing for full customization and modification. Complete CAD data is provided in the download section, including both .STEP and native Fusion format. 

BOM

• 12 x M3x5x4 Heat Set Insert (Voron Spec)