It holds the heads well so they dont tip over but also doesnt grab them too much so they are hard to take off, i printed mine in white PETG but PLA should work just as well.
Make sure you have your retraction tuned so it doesnt string when printing the upper parts! To test before printing the whole thing move it to -14,5 or -15 in your slicer depending on the strength of the bed adhesion on your printer!
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