CAD dimensions reference (Patreon)

last updated: Dec 28, 2021

There are things you learn when doing CAD for 3D printing, only after lots of trial and error or looking at other cads and how they did it (but then you have to trust they did it correctly). This is a reference of things that are solid and tested.
All models forward will be using these, but old model I made may not be as good, and will someday need revisiting

Using a common 0.4mm nozzle

• Tight fit between two printed pieces:
  - 0.2mm gap  
• Loose fit between two printed pieces:
  - 0.4mm gap
• M3 screws:
  - head opening: 6mm
  - head depth: 3.4mm
  - slide through opening: 3.6mm
  - screw hole opening when securing into plastic: 3mm
• M3 bolt (hex) - easy slide (used for my direct drive mount, and compatible with square bolt)
  - width 5.8
  - height 3.5
• M2.5 screws:
  - head opening: 5mm
  - head depth: 2.8mm
  - slide through opening: 3mm
  - screw hole opening when securing into plastic: 2.5mm
• Heat inserts M3x4x5 (sizexLxOD) in a blind hole:
  - opening: 4.7mm
  - depth: 5mm (plus max screw length, if possible make it 7mm to take into account the soldering iron tip length, not always doable, but if space allows do it)
  - chamfer: 0.4mm
• thinest walls
  - 1.2mm
• medium wall
  - 1.8mm
• thick solid wall
  - 2mm or more
• Pneumatic Fitting thread M6 and M10
  - 1mm thread
  - 4.5mm tall
  - scale up thread by a factor of 1.1 in X and Y, keep height the same

This is in regard to the attached file. A model of the ender3 mixed with ender3v2 mounting plate.