Ultimaker 2+ 1.75mm conversion

These are parts to upgrade an Ultimaker 2+, and possible other types, to 1.75mm filament. Aside from these printed parts you also need to purchase the hardware listed below.
It all fits together but I haven't run an operational test yet.
Use at your own risk!

I don't have a adapter for connecting the bowden tube to the extruder as a 1.75mm ptfe coupler I still had fitted pretty well.

Printed parts:
- Hot-end carriage top piece accommodating push fittings for 1.75mm filament bowden tubes. Left and right hole for optional dual extrusion set-up.
Update: added a new version which has room to pass the stock hot-end cooling fan through.
- Replacement arm for extruder for improved grip on the thinner 1.75mm filament. Not my design! found in on a website somewhere which I can't trace back. Print this in your strongest filament.

Optional:
- Bowden tube guide to help guide the tube into the ptfe coupler. It sits atop the ptfe coupler. Print this in petg or better heat resistant material. Th