Soft top roof panel middle sliders
To fit Smart 452 Roadsters
These have been 3D printed in strong Carbon Fibre reinforced PETG plastic. The roof tabs are in PETG plastic for flexibility in the roof fabric.
Straight from the print bed, these will benefit from light emery sanding to round off the edges for best fitment and sliding along your roof channels and roof cross struts.?
This set of 4 with tabs fitted suits one car roof.
It is the buyers responsibility to finesse and fit these to best suit their car roof. As with all plastic parts, excessive force will cause breakages!. 
I have ensured the included roof tabs fit properly, and include these with this sale.