improved grinding aid

Hello everyone,

I am absolutely delighted with Markus K.'s rolling sharpener

https://makerworld.com/de/models/1448977-rolling-knife-scharpener#profileId-1509199

but unfortunately, long knives were unstable on the grinding aid,

therefore I modified it so that magnets are also attached to the long sides.

I replaced the magnets with 10x2 magnets because I had these in stock.

Hello everyone,

I'm absolutely thrilled with Markus K.'s rolling sharpener

https://makerworld.com/de/models/1448977-rolling-knife-scharpener#profileId-1509199 ,

but unfortunately, long knives wobbled on the sharpening aid,

so I modified it to include magnets on the long edges as well.

I replaced the magnets with 10x2 magnets because I had them on hand.