Magnetic Core One/L Building Block Skin

Files

Uploaded files follow a simple naming convention:

<PrinterModel>_<MagnetSize>-Magnet_<BlockType>_<StudCount>-Studs_<Axis>.stl

• PrinterModel - If a part is specific to either the Core One or Core One L, the file starts with C1 or C1L. If a part is universally usable on both printers, this prefix is omitted.

• MagnetSize - nominal magnet size, diameter x thickness. The model will have slightly larger slot (+0.1 mm) to account for shrinking.

• BlockType - type of the building block, images and descriptions below.

• StudCount - length x width of the building block in units of studs. Default width is three studs, length is variable.

• Axis - Some parts are specific to the XY or Z axis. Parts that are not axis specific omit this part of the filename.

Example: 
C1_8x2-Magnet_Corner_5x3-Studs.stl 
refers to a Corner part, specific for the Core One, with a slot for a 8mm diameter by 2mm thickness magnet and with a length of 5 studs and a width of 3 studs.

Parts that are intended for a specific axis or orientation or for a specific printer have a text indicating correct usage on the rear.

Block types

Building instructions

Parts attach magnetically to the printer frame. Magnets fit into rear slots and can be glued in if needed. Supported magnet sizes: 8 × 2 mm and 6 × 3 mm. Segments can be joined with the provided connectors or compatible off-the-shelf building blocks.

Required parts:

• Core One: 8 corners, 49 studs on XY, 65 studs on Z
  → segment lengths: 39 and 55 studs

• Core One L: 8 corners, 55 studs on XY, 75 studs on Z
  → segment lengths: 45 and 65 studs

Use two hinge-cutout segments to keep the doors opening 180°: one directly after the top corner and one four studs after the bottom corner. Core One L not yet verified.

Corner orientation matters: the Z axis is slightly longer than XY. Check the rear markings. If gaps appear, rotate the affected corners.

Remixing and contributing

Published under CC BY in recognition of Prusa releasing Core One / Core One L CAD files. Commercial use, remixes, and reuploads are allowed with attribution.

Fusion and STEP files are included for easy remixing. The Fusion files are partly parameterized, so changes like magnet size or stud tolerance usually require editing only 2–4 parameters.

Need other magnet sizes, segment widths, or lengths? Ask in the comments or upload your own remix.

Changelog

• 17.05.2026: initial upload

• 22.05.2026: Removal of obsolete compensation blocks, update of corners and end blocks with text imprint.

• 22.05.2026: Addition of CORE One L specific corners and end blocks

• 25.05.2026: Addition of a new magnet size: 6x3mm

• 26.05.2026: Addition of the building block Nextruder cover

• 31.05.2026: Addition of a building block knob for the display

• 13.06.2026: Big update with 4x panels covering the sides and front of the printer