Updated 2026-01-06: See notes at bottom

This is a functional and fully printable (no fasteners or hardware required) dispensing mechanism. It is designed for Kirkland Dog Biscuits sold through Costco but could be used in many other dog biscuits and other applications. I have also included a small printable box that can be printed in quantity and filled with candy or treats for kids or other uses.

This dispenser is an awesome demonstration of a 3d printed mechanical system and could be used for educational purposes as well. While everyone might not need a dog treat dispenser (or candy dispenser) I hope most people will appreciate the complexity of the design and its capacity to help us dream bigger with our 3d printers. This project has about 30 parts to it and that makes it my most complex operating design so far.

Here are some of the design features incorporated into this project:

• Compliant compression and leaf springs
• Full and partial double helical gears
• Cam-driven gate
• Double helical rack and pinion
• Adaptive hook design on the delivery system
• Removable crumb tray
• Loading cartridge

The included dispensable box has a volume of 102 x 43 x 14 mm

**Print Settings**

For the best results, I suggest the following: Material = PLA for everything except the compression springs. I recommend PETG for the compression springs. Nozzle = 0.4mm Layer Height = 0.2mm Line Width = 0.4mm Wall Count = 4 (1.6mm) Top and Bottom Layer Count = 5 Detect Thin Walls = ON Wall Generator = Arachne Infill = 40% (Cubic) Support = No, all required support is incorporated into the design. Print orientation = As per the STL/3MF files.

Please refer to the linked video for assembly instructions.

Related Links

Visit my blog for more details and other designs: https://www.logicalplanet.com/

Revisions and Updates I occasionally update and revise my designs. When I do, I’ll document the changes here. Check back periodically for the latest revision notes or if you’re experiencing any issues with a model.

2026-01-06: I found that the Kirkland biscuits from Costco were creeping up in size as their mold degraded. And, the iincreased-sized biscuits were not dispensing well. So I have made an alternative design that is approximately 6mm deeper (front to back) allowing the larger biscuits to dispense well again. I also should note that biscuits dispense much better when they are loaded right side up into the dispenser. The entire main structure needs to be reprinted but the gears and springs on the side remain the same and can be reused in the new larger version. I am attaching this new version as a zip file to the download so that the original size is still available too.