I needed the ability to cut card and self-adhesive vinyl with a knife, so I got one of these - £5.62 on E-bay with 15 knives. Then I needed a holder to attach it to the Z axis. I 3D printed this one to try the idea. It worked successfully but I wasn't sure the thread for the grub screw to hold the knife holder would last so I decided to make an aluminium one. Standard unmodified Ooznest workbee, Makita (actually a Chinese clone), cheap (less than £1 each) router bits, speed 10K rpm, feed 500 mm/min, doc 0.2 mm, finishing path 0.05 mm. This is a bracket to hold a Roland plotter knife holder. I needed to drill and tap a hole for a grubscrew to hold the knife holder which I did in the pillar drill - because of the adjustment on the top of the knife holder it has to go in from above - a plotter pen could go in from below and wouldn't need the grub screw. For a first complete job in aluminium I'm satisfied with the results - not quite the quality I've achieved in the past on a manual milling machine, but fairly good considering the limitations of the workbee/router combination. As this was my first serious attempt cutting aluminium I decided to use some really cheap (router - single and two flute straight) bits and they worked very well. Cutting the rebates with a 1/8" single flute bit the bit didn't even get warm. Cutting the two 5.25mm holes was more of a problem - it was really difficult to clear the chips and the bit overheated on the second hole and snapped - just as it finished the hole! The 11.7mm hole for the knife holder was cut with a 2 flute 1/4" bit and again it hardly got warm. Will post the files if anyone really wants them but it's a pretty straightforward cad job. I've now given away the 3D printed version to someone who is using it as a pen holder. The aluminium block fixes to the Z axis C-beam underneath the router mount and can be left in place if the knife holder itself is taken out. Alex.