Thicker cutting edge

[cliff park]

I used to use a steel rule for a cutting edge, and had trouble with the knife occasionally slipping across the ruler. Then I realised that a 'combination square', shown below, has a 2mm thick blade. This can be slid out to make a really good guide for a knife, particularly on thick card where more pressure may be required. Beware of parallax with the thicker edge.  It can of course always be slid back in for its original purpose. They are available for less than £5 from Toolstation if you don't have one.  (Sorry the pic is out of focus)

 

Edited January 19, 2022 by cliff park

[westernviscount]

If you want a thicker rule, you might also try one of these...

Its a clear acrylic rule which is pretty standard with a steel edge for use with a knife. So you can see through it and use for drawing and positioning as well as cutting. You can also get 60cm ones I think. I like the 5mm squared area for easier positioning. Mine is by JAKAR. 

Edited January 27, 2022 by westernviscount