Features:

• Place in the back for magsafe metal ring (tested with Baseus)
  
• Case is thicker in the back than the camera bump, so it sits flat on the desk
• Features cutouts for the type-C port, buttons and top microphone, so it should be relatively easy to install

Recommended printing settings:

• Set high count of top/bottom layers to make back solid
• Turn off supports
• Ideally print ‘primary’ part with something little bit flexible with strong layer adhesion to avoid breaking (eg. PLA-CF, PETG)

Slicing instructions:

On multicolour capable printers:

For 3MF:

• Add 'primary' to slicer
• Click add part → load 'secondary'
• Assign colours for multicolour

For STEP:

• Add model to slicer
• Split → to parts
  
• Assign colours for multicolour

On other printers:

Watch beforehand, goes in detail about whole process:

https://youtu.be/m_SXRGGoTQo

For 3MF:

• Add 'primary' to slicer
• Click add part → load ‘secondary’
• Split → to objects
  
• Hide primary
• Slice, print, remove skirt (either in slicer beforehand or manually afterwards)
• Hide secondary (remember to turn off supports)
• Slice and print

For STEP:

• Add model to slicer
• Split → to objects
  
• Hide primary
  
• Print, remove skirt (either in slicer or manually)
• Hide secondary (remember to turn off supports)
• Slice and print