Extra extruder

how much does it costs to buy an extra extruder head, beacauese I want tto experiment with different materrials

Please: This technical forum is not the right place for ‘how much’ and ‘where’ questions.
Prices and availability vary with region/country, etc…

As we do not sell direct, your Velleman distributor is the best place to look for spare parts.

Please consider the following:
Not all distributors sell the printer and/or the spare parts.
Even if they do, not all distributors have them on stock, sometimes they will have to order them for you.
Sorry, we cannot point you to a distributor, as that would be unfair towards our other distributors.