This is a small 10mm riser for the p1s.  This does the job on my printers when it comes to preventing the ptfe tube from rubbing the glass. 

No need to spend double the material / print time for larger ones.

Printed it in PLA at 20% infill with 3 walls. 

Can also use print in PETG if needed but the PLA should hold up perfectly well. 

If you print a lot of high temp items, then might lean more toward the PETG side.