Are there any plans to produce a dual material head to use the abrasive filament with build support material so, ruby tip and normal tip.
A dual abrasive head is possible but not currently planned. The Needle valves make the DM head work so well for DM prints, avoiding strings and dribble while allowing very fast material changes during the print. The current design of the Olsson nozzle does not allow use of needle valves.
The next head we intend to release is a high temperature head based around a special nozzle from Olsson and our own heater block. This will allow high temperature materials such as Ultem and PEEK to be run through existing Robox units simply by changing the head.
For official support please create a support ticket using this link www.cel-robox.com/support/
Doesn't really matter what low cost material is used for support, at the moment there is no choice other than to use the carbon material as the support which is not very cost effective.