About this 3D model

I'm using a server cabinet as an enclosure for my Pruas i3 MK3. To take the weight off of the frame I've designed a spool holder that you can attach to the 'metal bars' (see pictures) that came with my cabinet. Things you'll need: 1* part A1* part B2* pin1* rod to put the spool on. I've designed the parts for a rod diameter of 3 cm. Not sure how well a smaller rod would work out.