I designed what is essentially a large pencil sharpener to cut down fire brick into kiln plugs!

Hardware required:

• 2x M3 x 4mm x 5mm threaded insert
• 2x M3 x 4mm bolt
• 1x utility blade

I had half of a fire brick laying around and I was able to quarter it and make 4 kiln plugs. Can be printed in standard orientation without supports. Just cut down your fire brick into rectangular chunks and just twist them into the sharpener exactly how you would sharpen a pencil