This mount has nice, big suction cup:
(but way too big tablet holder for 7 inch devices)
while this mount has really nice tablet holder
(but not that great suction cup)
so this adapter combines both of them into one 7 inch tablet mount with big suction cup.
Printed in PLA.
Printed in ABS+.
Printed in horizontal with supports to get more strength.
In case of ABS+ due to material shrinkage you will most likely need to make mount hole (for metal part) bigger or use hot air gun when mounting it.
Shorter version, doesn't need any adjustments even with ABS, so easier to print. Metal part is no longer needed.