Centre Finder

Here's a Centre Finder I pulled together for use in wood turning, I use a lot of smallish wood and found not always that the normal centre finders work as they are intended. This one seems to find the centre perfectly.

Print at 0.16 with 4 wall loops and 25% infill for a strong model with an accurate hole for the blade, 0.20 you might have to scrape out the blade hole. I use PLA plus and it feels perfectly strong enough. 

The blade you need for this to work is a 9 mm modelling knife blade ( see link below )  if you want to use the full length then you will need  2 blades. You can superglue your blade into this if you find it is loose (clean any oil off with a solvent first) the hole is 0.35mm wide which allowed me to use a mini Stanley blade, it will also fit other makes of blade.

Safety, if you are worried about cutting your hands on this model once assembled, mount the blade upside down so that the sharp edge is inside the plastic hole, if your not then mount as intended with the blade upright.

To use just pop in your piece of wood, tight to the corner and either tap lightly or just use hand pressure and a line will appear, rotate and create a second line and you will have a perfect centre. If you whack it hard with a large hammer it will eventually break ! 

Disclaimer:  Use at your own risk. Its safer if its screwed down or on a wall and is much easier to use then. Use M5 screws to fix to a surface

*  https://www.amazon.co.uk/Retractablr-Knife-Blades-9mm/dp/B01MEFF1ZS?crid=3MWKE1XVQMVQT&dib=eyJ2IjoiMSJ9.MbkTEiZSxtnMeQ5KfnAIMXEdT5PvkZsjX9AbYq1MSDQojXxgyVbFaGdfZZ2nffVS4pZdho1eU7Pd0RuI98PCOQ7mZi-DAHm0g2rdK_Fi0UAL7fhP94ka3-9CukPxA8LG1kHiU6k1fCm8wNEzOBqDdvj8C2-8IjpA4oDvTjJSI-iasyaJFG3s5dBLx7-yF-Cgg2gmEkE6fNMCjz16_1_-c-7fu0EatFAFNH8u1BJ4lEE.oIrjACSAFVFCrTOXhE9hU4sdLIbfPCzfZql7GjV3u0c&dib_tag=se&keywords=STANLEY%2B9mm%2BSnap%2BOff%2BBlade&qid=1748703250&s=diy&sprefix=stanley%2B9mm%2Bsnap%2Boff%2Bblade%2Cdiy%2C107&sr=1-2&th=1