Sectioned lock transparent wall

What is inside the doorlock mechanism we use everyday? Principle of this ingenious mechanism is presented in the half-cut enlarged doorlock model with simple pin mechanism. If you lost your key you can always print another!

Spring-loaded pins action is visible under transparent plates, so we can see what happens when you insert the key into lock. When all pins are aligned correctly, the lock can be rotated.

Remixes, improvements, uses in other models are welcome.

Please make sure you read the instructions below, to have flawless experience.

For the visibility of the parts we need 2 simple plates printed with special settings with TRANSPARENT PETG/PCTG. All other parts can be printed with filament of your choice. Prototype seen on photo is printed with Spectrum ASA275 and DD PETG transparent.
For the transparent PETG parts, I include Prusa MINI gcodes, but be aware - those are only rough reference, please adjust to your printer and filament.

Printed model presented on pictures is a prototype - final version is slightly different. PLATE_ROLLER here presented is printed on smooth sheet, PLATE_HOUSING - textured.

Additional parts required:

• bolts: socket head (for allen key) M4x12: x4
• brass inserts: M4x6x5(width x height): x4
• screws: M3x10: x3
• springs: 3mmx25mm - common springs in pen mechanisms are enough. x4
  Just be aware not all are made equally strong, this mechanism doesn't require much force and can work better with weaker ones.

Printing:

• parts HOUSING, ROLLER should be printed without supports (required supports are added in pin holes sides - remove after printing). Orientation on picture.
  • nozzle:0,4mm, layer height 0,2mm, perimeters:3, infill:25%, no brim required
• parts FIX BOTTOM, FIX_FRONT, KEY - same as above, but add supports for >45 degree overhangs. Orientation on picture.
• pins - same as above except add brim. MOVE pins print on bigger wall, SPRING - on the cone
• PLATE_HOUSING and PLATE_ROLLER - PCTG or PETG transparent required (PETG on photo). We need special settings for best results:
  • slow speeds (20mm/s everywhere)
  • no top and bottom layers
  • 0,1 layer height
  • cooling disabled
  • infill - 100% aligned rectilinear
  • flow - around 5% higher than optimal
  • temperature - highest possible for the material
  • texture sheet: acceptable
  • smooth sheet with tape/glue separation layer: clearly (pun intended) better
  • For the best visibility I highly recommend following tutorial by CNC Kitchen:

Tools:

• screwdriver +
• allen key 3mm (M4)

Mounting order

• Mount PLATE_ROLLER with 3x M3x10 screws to the ROLLER
• Insert ROLLER into HOUSING by sliding and turning from above
• Align PLATE_HOUSING with HOUSING - front and back are NOT equal - align with curvature of ROLLER
• Use 3x M4 bolts to attach FIX_FRONT to the assembly
• Insert PIN(X)MOVE (1st to the left, 4th to the right). Pointy end up.
• Insert PIN(X)SPRING (same order as above). Again, pointy end up
• Insert springs. To fully insert the springs pin holes in ROLLER and HOUSING must be aligned
• Attach FIX_BOTTOM with last M4 screw. If the tension of mechanism is too strong you can experiment by loosening the bolt and/or adding shims between the FIX_BOTTOM and HOUSING
• use the KEY to check if lock is assembled correctly. If it isn't, make sure:
  • pins are in correct order and orientation
  • pin holes are clear without any printing artifacts
  • ROLLER can slide freely in HOUSING
  • mechanism without springs works when is oriented such way, that FIX_BOTTOM is UP - gravity works as springs
  • if everything above fails - comment to check possible solutions  

As always, have a nice day and happy printing!