See / edit it here in Fusion 360: https://a360.co/2UGFDIZ

WORK IN PROGRESS =================

This is a training toy for dogs. You can put a treat (~1cm size) in the hole at the top that will be dispensed when the button in pushed.

Parts ====

• Rubber bands to the length of your liking
• 3x M3-inserts (344 size)
• 3x M3x10 round head screws
• 3x 4cm PTFE tube, 4mm diameter (optional)
• 1x Bottom
• 1x Insert
• 1x Deckel
• 3x Plug (for the bottom)
• 3x Plug2 (for the top)

(The plugs probably don't matter where you put them, but the one of them is just slightly shorter)

Assembly =======

If you use the optional PTFE tubes so it slides better:

• Insert the PTFE tubes into the slots at the corners of the "inlay" print

• Slowly insert the insert into the bottom part. If it doesn't slide free, sand/cut the outside of the tube a bit until it slides with little resistence

• Insert the M3 brass inserts as shown with a soldering iron or a matching tool

• Assemble the deckel and insert part

• Using the top (Plug) and bottom (Plug2) plugs, fix rubber bands between top and bottom

• Insert the assembly into the bottom part

• Mount with the M3 screws