EDIT 04MAR2025: I added a vented set of rings for downdraft dust collection. Vented JessEm Compatible Ring Inserts for Router Lifts

I needed to replace a couple of the ring inserts on my JessEm Mast-R-Lift router table, but I wanted to see if I could duplicate it instead of just buying one because, well. . . I can.

So, I was able to successfully duplicate the insert plate, and then I made it parametric, so I just had to put in the diameter of the hole, and everything else was automatic. Then, I decided to put numbers on them to easily differentiate them.

These plates work perfectly with the JessEm Mast-R-Lift I have, and the wrench fits without issue as well. The texture on the top surface is from the Prusa textured print bed surface, which I really like.

Do not use supports. Prusaslicer complains, but they print just fine without supports. I have been using them for a couple of weeks without issue. I printed them in PLA and PETG. The PLA ones are more rigid, so that is what I ended up printing all of mine in. They were printed with 4 perimeters, 6 top and bottom layers, and 30% gyroid infill (what little infill there is).

They are numbered from 1 to 10, and the number is the diameter of the hole, in 4ths of an inch.

1 = 1/4" 2 = 1/2" 3 = 3/4" . . . 9 = 2-1/4" 10 = 2-1/2"

I also designed and printed a holder for them, since I wanted them to be mounted on my wall.