This is a adapter fitting the tripod 2" eyepiece holes of a Celestron NexStar 4SE. With this it is possible to use the two 2" holes also for 1,25" eyepieces.
I highly recommend to print this with PETG as it is more flexible and durable. The margins are quite tight and I tried to keep the amount of material low for this model. PLA might break when inserting the adapter.
No support or brim needed.
The author marked this model as their own original creation.