Coin Operated Vending Machine

This is a coin operated vending machine designed for fun-sized candy bars. It takes American quarters or the included discs of the correct size. Use the key to unlock to door on the back to restock the machine and access the coin drawer to collect your earnings!

Update July 10, 2025

I have updated the model with the following revisions and additions:

1. Added alternate coin mechanisms for 1 Euro and 2 Euro coins
2. Revised “CoinMech-Faceplate” to be compatible with Euro Coins (Note: Euro Coins and Quarters use the same faceplate)
3. Added printable ‘dummy’ coins for 1 Euro and 2 Euro coins
4. Revised Lock Bolt to add notch which better secures the door
5. Revised 2-unit door to better engage with lock bolt
6. Added alternate doors compatible with 1, 2, 3, 4, 5+ stacked vending units
7. Revised ‘Coil’ to add a small sacrificial disc on one end to prevent support material forming on the interior of the coil. Please refer to the video assembly guide for more information.
8. Revised ‘CoinMech-InternalFrame’ to add cutouts and adjust tolerances for better fit
9. Revised ‘CoinMech-BevelGear’ to add cutouts for spoked appearance
10. Revised ‘CoinTray’ to raise one side and prevent coins bouncing out of trayn addition to printed parts, the following hardware is required:

Tips for Printing and Assembly

1. This is an intricate mechanism with many moving and interlocking parts, making dimensional accuracy essential. This should ONLY be printed if you are confident that your printer is well calibrated and capable of printing dimensionally accurate parts.
2. Follow the assembly steps as shown in the video. Assembling parts out of order may cause issues.
3. Refer to included pdf titled “Assembly Guide” for threaded insert and screw locations/layouts
4. If you have a mid-sized printer (like the Prusa MK4, Core One or BambuLab A1, etc.) print the files in the folder “00-MultiplePieces-Standard”. The following parts must be glued together
   1. Frame and Dropper
   2. Cap 1 and Cap 2
   3. Base 1 and Base 2
5. If you have a larger printer (like the Prusa XL, Bambulab H2D, etc.) print the files in the folder “00-SinglePiecesXL”
6. Files which include “MULTI” in the name must be printed multiple times, depending on the number or vending units desired.
   1. For example - If you are making 3 vending units, print 3 copies of each file with ‘MULTI’ in the name
7. Print ONLY ONE ‘CoinMech-Cog…’ depending on what currency you want to use
   1. For example - If you want to use US Quarters, print ‘CoinMech-Cog-Quarter-Multi’. Do NOT print ‘CoinMech-Cog-1Euro-MULTI’ or ‘CoinMech-Cog-2Euro-MULTI’.
8. Print ONLY ONE ‘CoinMech-Arm…’ depending on what currency you want to use. ‘CoinMech-Arm-Euro-MULTI’ is used for both 1 Euro and 2 Euro
9. The parts required to make the door for machine with 3 units are:
   1. One of each of following: Door-Tri-BottomPanel , Door-Tri-MiddlePanel , Door-Tri-TopPanel
   2. Two each of “Door-Tri-Hinge-Bottom-MULTI’ and ‘Door-Tri-Hinge-Top-MULTI’
10. The parts required to make the door for a machine with 4 units are:
    1. One of each of following: Door-Tri-BottomPanel , Door-Tri-TopPanel
    2. Two copies of Door-Tri-MiddlePanel
    3. Four copies of “Door-Tri-Hinge-Bottom-MULTI’ and ‘Door-Tri-Hinge-Top-MULTI’
11. The parts required to make the door for a machine with 5+ units are:
    1. All the same parts as machine with 4 units PLUS additional middle panels for every unit over 4:
       1. One copy of ‘Door-Tri-MiddlePanel’
       2. Two copies of “Door-Tri-Hinge-Bottom-MULTI’ and ‘Door-Tri-Hinge-Top-MULTI’

In addition to printed parts, the following hardware is required:

• Threaded Inserts* - M4xL6xD6
  • Quantities
    • Single vending unit: 20
    • 2 Vending Units: 31
    • 3 Vending Units: 42
    • More than 3 Vending Units: 42 PLUS 11 per additional vending unit
      • For example: 5 Units require 64
  • https://www.amazon.com/dp/B0D3VS3F76?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
• M4xH8 Screws
  • Quantities
    • Single Vending Unit: 17
    • 2 Vending Units: 25
    • 3 Vending Units: 33
    • More than 3 Vending units: 33 PLUS 8 per additional vending unit
      • For example: 5 units require 49
  • https://www.amazon.com/dp/B01M272GW6?ref=ppx_yo2ov_dt_b_fed_asin_title
• M4xH10 Screws
  • Quantities
    • Single Vending Unit: 3
    • 2 Vending Units: 6
    • 3 Vending Units: 9
    • More than 3 Vending units: 9 PLUS 3 per additional vending unit
      • For example: 5 units require 15
  • https://www.amazon.com/dp/B0DG2QNKNL?ref=ppx_yo2ov_dt_b_fed_asin_title
• Metal Dowels 5mm x 40mm
  • Quantities
    • Single Vending unit: 3 total (1 for coin mech, 2 for cap/door hinge)
    • 2 Vending Units: 4 total (2 for coin mechs, 2 for cap/door hinge)
    • 3 Vending Units: 7 total (3 for coin mechs, 2 for cap/door hinge, 2 for door/door hinge)
    • More than 3 Vending Units: 7, PLUS 3 per additional vending unit
      • For example: 6 units require 16
  • https://www.amazon.com/Adyoney-Stainless-Support-Shelves-Silver/dp/B0CR6FQ7Q2/ref=sr_1_3?crid=3IC9J5IFVD6Q2&dib=eyJ2IjoiMSJ9.GdWonO7yCTpcV0BE27h-UljSPGMdYBYt7tmZ3bOR3OH1VWk21WE0SslZPR98MbQU2FlgfBapSH4g9dZAsSb6wX6Qdubtq_tLQZJKU4Kj1gnGGJ0Druzmq7afyp6-IMm4nyN81UjMi2Nii3C-eObnLuQTBemO3hNjiLCXeJkiew5W53TTwFBRSoV0GUAByOuvY6vkPR3Au4LlNaDWcSryCbN0DrvPTrH8Rhj1LFa7P6KUpscFXtfP30zNkAu4Sw9WTVjXgqRCGxxhyr8bh41u6GnPhUYnFccv76Xw6Km98gg.MqbjBRc7PXQW8G8bOXDslGkRqMhUrukj_wZerDQN46o&dib_tag=se&keywords=5mm%2Bx%2B40mm&qid=1749991650&s=industrial&sprefix=5mm%2Bx%2B40mm%2Cindustrial%2C77&sr=1-3&th=1
• Ball Bearings - 2 per vending unit
  • https://www.amazon.com/dp/B07C6FL8TW?ref=ppx_yo2ov_dt_b_fed_asin_title