Spool holder with guide

this is a spool holder based on design from others. I have make some modification on it .

things that you require to purchase additionally
- 608zz bearing 2pcs
-m3 x 25 screw or longer 2x.
-m3 nut 2x
-m3 flat washer 4x

additional modication compared to model online
1) added spool guide part to ensure spool do not go off track and stuck in between the bearing and the spool holder.
2) added holes for m3 screw to go through for assembly purpose.
3) raised edges on overall dimension for spool holder
4) adjusted some dimension for better and easier fitting of the bearing.
5) added a small undercut at bottom of the spool holder for future development.