Hi, so i created this in order to print simply soft materials like PP or TPU shore A 85 - tested.

Two way to use this either dont you printers top cover - in this case you also need to print 2x Spool top holder clip to fix it in place.

Or with included top cover where weight of plastic it self secures it in place.

In any case you need to print rest of parts.

In my design i also use 2x bearing (8*22*7mm)that i had around by if there will be big intrest in this i can change design to make it work only with plastics.

To use this you need to put filament on middle part and than insert side - it can be done afterwards if fillament has big enough inner diamater. 

On printer side you either need to remove spliter it self for each print and feed material directly or if you are able to remove one of tubes you can feed line in it. I sugesst to remove spliter by unscrewing two screws it is easy and rest of connected tubes are not buming in holder it self.

Also this doesnt need to be positioned excatly in middle of printer like on picture in can be positioned on either side. Try your luck.

I would be happy if anybody who try to print this will give me feedback.

All printed out of PETG infill 80% supports enabled.