Bench Dog for 20mm holes

You need:

• e.g PETG Filament
• one countersunk head screw M8x1.25 35mm  length , head diameter 16-17mm
• 2 part epoxy glue
• a 3d Printer ;-)

Works fine for all 20mm holes to hold wood panels or other things in place while you are working on your workbench. I first printed it in 100% PETG no infill. 

My first model cracked when applying a reasonable amount of pressure. 

So I asked myself how to reinforce the Structure an preventing the bench dog from breaking appart. M

Most likely everybody has some screws in their workshop. So I designed a central screw tom enforce the cylinder. You will need countersunk head screw,  M8 and 35mm length (see picture). 

Preferably use a thread tap M8x1.25. In spite of the fact that there is a preprinted thread in the model, it will be easier to get the screw in if you use the corresponding metric thread cutting tap. 

I used an 2 part epoxy glue and I think this is a good possibility to add even more strength to the part. 

Until now the combination with an M8 screw seems stable enough  I couldn't break the bench dog appart using it in the Workbench. If you want change the Design and use a cylinder head screw. 

happy printing…