Weed trimmer line cutting jig

I wanted a simple way to cut the line that I bought a big roll of for my yard trimmer. I came up with this pipe design its not perfect as I was looking for 8-¼ pieces and they come out 8-3/8. But that's fine so not worth reprinting. 

Its 3 parts because its too long to print on a mini+ (can't wait for the XL). It has a simple gate at 1 end that you close and push the trimmer line in on the other end. The slot for a knife or razor is at an angle to make loading them in the trimmer easier.

I'm posting the Fusion 360 model so you can easily adjust it to your needs.

It will require a little bit of supports on the flat and pin on part A. I had a plan to fix that also but if the proto type works fine why reprint it.

Edit; Part B v3 added. After about 50 parts I broke the guide tab on part B. It was my fault I was rushing through them and twisted the knife. It would still do the job but I made an improved version that is is thicker so it will not break as easy and added a lead in on the tube after the knife slot as the line would catch a bit as I pushed in the next part.